{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T00:23:16Z","timestamp":1790036596830,"version":"4.0.1"},"reference-count":92,"publisher":"Elsevier BV","issue":"3","license":[{"start":{"date-parts":[[2017,9,1]],"date-time":"2017-09-01T00:00:00Z","timestamp":1504224000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[2017,9,1]],"date-time":"2017-09-01T00:00:00Z","timestamp":1504224000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/legal\/tdmrep-license"}],"content-domain":{"domain":["ajog.org","clinicalkey.com","clinicalkey.com.au","clinicalkey.es","clinicalkey.fr","clinicalkey.jp","elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["American Journal of Obstetrics and Gynecology"],"published-print":{"date-parts":[[2017,9]]},"DOI":"10.1016\/j.ajog.2017.04.025","type":"journal-article","created":{"date-parts":[[2017,4,25]],"date-time":"2017-04-25T14:47:25Z","timestamp":1493131645000},"page":"330.e1-330.e15","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":40,"title":["Adverse pregnancy, birth, and infant outcomes in twins: effects of\u00a0maternal fertility status and infant gender combinations; the Massachusetts Outcomes Study of Assisted Reproductive Technology"],"prefix":"10.1016","volume":"217","author":[{"given":"Barbara","family":"Luke","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daksha","family":"Gopal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Howard","family":"Cabral","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Judy E.","family":"Stern","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hafsatou","family":"Diop","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1016\/j.ajog.2017.04.025_bib1","first-page":"1","article-title":"Births: final data for 2015","volume":"66","author":"Martin","year":"2017","journal-title":"Natl Vital Stat Rep"},{"key":"10.1016\/j.ajog.2017.04.025_bib2","doi-asserted-by":"crossref","first-page":"1832","DOI":"10.1001\/jama.282.19.1832","article-title":"Live-birth rates and multiple birth risk using in\u00a0vitro fertilization","volume":"282","author":"Schieve","year":"1999","journal-title":"JAMA"},{"key":"10.1016\/j.ajog.2017.04.025_bib3","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1053\/j.semperi.2005.08.003","article-title":"Addressing the growing problem of multiple gestations created by assisted reproductive therapies","volume":"29","author":"Nakhuda","year":"2005","journal-title":"Semin Perinatol"},{"key":"10.1016\/j.ajog.2017.04.025_bib4","doi-asserted-by":"crossref","first-page":"351","DOI":"10.1016\/S0140-6736(07)60456-5","article-title":"Outcome of assisted reproduction","volume":"370","author":"Sutcliffe","year":"2007","journal-title":"Lancet"},{"key":"10.1016\/j.ajog.2017.04.025_bib5","doi-asserted-by":"crossref","first-page":"2218","DOI":"10.1056\/NEJMoa1301467","article-title":"Fertility treatments and multiple births in the United States","volume":"369","author":"Kulkarni","year":"2013","journal-title":"N\u00a0Engl J Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib6","doi-asserted-by":"crossref","first-page":"1","DOI":"10.15585\/mmwr.ss6411a1","article-title":"Assisted reproductive technology surveillance\u2013United States, 2013","volume":"64","author":"Sunderam","year":"2015","journal-title":"MMWR Surveill Summ"},{"key":"10.1016\/j.ajog.2017.04.025_bib7","first-page":"233","article-title":"Assisted reproductive technology in Europe, 2011: results generated from European registers by ESHRE","volume":"31","author":"Kupka","year":"2016","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib8","series-title":"2011 Assisted reproductive technology success rates: national summary and fertility clinic reports","year":"2013"},{"key":"10.1016\/j.ajog.2017.04.025_bib9","doi-asserted-by":"crossref","first-page":"314","DOI":"10.1016\/j.fertnstert.2011.05.073","article-title":"Birth outcomes of intended pregnancies among women who used\u00a0assisted reproductive technology, ovulation stimulation, or no treatment","volume":"96","author":"D\u2019Angelo","year":"2011","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib10","doi-asserted-by":"crossref","first-page":"345","DOI":"10.1038\/jp.2014.17","article-title":"Impact of ART on pregnancies in California: an analysis of maternity outcomes and insights into the added burden of neonatal intensive care","volume":"34","author":"Merritt","year":"2014","journal-title":"J\u00a0Perinatol"},{"key":"10.1016\/j.ajog.2017.04.025_bib11","doi-asserted-by":"crossref","first-page":"1724","DOI":"10.1093\/humrep\/dev090","article-title":"Risk of hypertensive disorders in pregnancies following assisted reproductive technology: a cohort study from the CoNARTaS group","volume":"30","author":"Opdahl","year":"2015","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib12","doi-asserted-by":"crossref","first-page":"1492","DOI":"10.1016\/j.fertnstert.2015.03.018","article-title":"Pregnancy-related complications and adverse pregnancy outcomes in multiple pregnancies resulting from assisted reproductive technologies: a meta-analysis of cohort studies","volume":"103","author":"Qin","year":"2015","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib13","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1111\/ppe.12287","article-title":"The impact of ART on live birth outcomes: differing experiences across three states","volume":"30","author":"Luke","year":"2016","journal-title":"Paediatr Perinat Epidemiol"},{"key":"10.1016\/j.ajog.2017.04.025_bib14","doi-asserted-by":"crossref","first-page":"922","DOI":"10.1016\/j.fertnstert.2012.05.049","article-title":"Adverse obstetric and perinatal outcomes of singleton pregnancies may be related to maternal factors associated with infertility rather than the type of assisted reproductive technology procedure used","volume":"98","author":"Hayashi","year":"2012","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib15","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1007\/s10815-015-0610-3","article-title":"Is the wrong question being asked in infertility research?","volume":"33","author":"Luke","year":"2016","journal-title":"J\u00a0Assist Reprod Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib16","doi-asserted-by":"crossref","first-page":"1320","DOI":"10.1111\/1471-0528.13584","article-title":"Obstetric consequences of subfertility: a retrospective study","volume":"123","author":"DoPierala","year":"2016","journal-title":"BJOG"},{"key":"10.1016\/j.ajog.2017.04.025_bib17","doi-asserted-by":"crossref","first-page":"303","DOI":"10.1016\/j.fertnstert.2012.12.035","article-title":"Low birth weight: is it related to assisted reproductive technology or underlying infertility?","volume":"99","author":"Kondapalli","year":"2013","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib18","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1186\/s13148-015-0071-7","article-title":"DNA methylation differences between in\u00a0vitro- and in\u00a0vivo-conceived children are associated with ART procedures rather than infertility","volume":"7","author":"Song","year":"2015","journal-title":"Clin Epigenetics"},{"key":"10.1016\/j.ajog.2017.04.025_bib19","doi-asserted-by":"crossref","first-page":"1644","DOI":"10.1093\/humrep\/den150","article-title":"Factors affecting low birthweight after assisted reproduction technology: difference between transfer of fresh and cryopreserved embryos suggests an adverse effect of oocyte collection","volume":"23","author":"Shih","year":"2008","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib20","doi-asserted-by":"crossref","first-page":"2545","DOI":"10.1093\/humrep\/det272","article-title":"Perinatal outcomes of children born after frozen-thawed embryo transfer: a Nordic cohort study from the CoNARTaS group","volume":"28","author":"Wennerholm","year":"2013","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib21","doi-asserted-by":"crossref","first-page":"e80398","DOI":"10.1371\/journal.pone.0080398","article-title":"Perinatal outcomes by mode of assisted conception and sub-fertility in an Australian data linkage cohort","volume":"9","author":"Marino","year":"2014","journal-title":"PLoS One"},{"key":"10.1016\/j.ajog.2017.04.025_bib22","doi-asserted-by":"crossref","first-page":"2167","DOI":"10.1007\/s10995-014-1465-4","article-title":"The MOSART database: linking the SART CORS clinical database to the population-based Massachusetts PELL reproductive public health data system","volume":"18","author":"Kotelchuck","year":"2014","journal-title":"Matern Child Health J"},{"key":"10.1016\/j.ajog.2017.04.025_bib23","doi-asserted-by":"crossref","first-page":"1445","DOI":"10.1007\/s10815-013-0092-0","article-title":"Live birth rates and birth outcomes by diagnosis using linked cycles from the SART CORS database","volume":"30","author":"Stern","year":"2013","journal-title":"J\u00a0Assist Reprod Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib24","doi-asserted-by":"crossref","first-page":"463","DOI":"10.1016\/j.fertnstert.2013.10.028","article-title":"Identifying women with indicators of subfertility in a statewide population database: operationalizing the missing link in ART research","volume":"101","author":"Declercq","year":"2014","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib25","doi-asserted-by":"crossref","first-page":"1315","DOI":"10.1016\/j.fertnstert.2014.01.053","article-title":"Calculating length of gestation from the Society for Assisted Reproductive Technology Clinic Outcome Reporting System (SART CORS) database versus vital records may alter reported rates of prematurity","volume":"101","author":"Stern","year":"2014","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib26","doi-asserted-by":"crossref","first-page":"e4","DOI":"10.1016\/j.fertnstert.2014.07.019","article-title":"The occurrence of birth defects in relation to assisted reproductive technologies in the Massachusetts Outcomes Study of Assisted Reproductive Technology database","volume":"102","author":"Getz","year":"2014","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib27","doi-asserted-by":"crossref","first-page":"1437","DOI":"10.1007\/s10815-014-0327-8","article-title":"The effect of father\u2019s age in fertile, subfertile, and assisted reproductive technology pregnancies: a population based cohort study","volume":"31","author":"Stern","year":"2014","journal-title":"J\u00a0Assist Reprod Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib28","doi-asserted-by":"crossref","first-page":"888","DOI":"10.1016\/j.fertnstert.2014.12.119","article-title":"Perinatal outcomes associated with assisted reproductive technology: the Massachusetts Outcomes Study of Assisted Reproductive Technologies (MOSART)","volume":"103","author":"Declercq","year":"2015","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib29","doi-asserted-by":"crossref","first-page":"1438","DOI":"10.1016\/j.fertnstert.2015.02.027","article-title":"Adverse pregnancy and birth outcomes by infertility diagnoses with and without ART treatment","volume":"103","author":"Stern","year":"2015","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib30","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1016\/j.fertnstert.2015.04.006","article-title":"Adverse pregnancy outcomes after in\u00a0vitro fertilization: effect of number of embryos transferred and plurality at conception","volume":"104","author":"Luke","year":"2015","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib31","doi-asserted-by":"crossref","first-page":"e64","DOI":"10.1097\/EDE.0000000000000371","article-title":"Maternal postpartum hospitalization following assisted reproductive technology births","volume":"26","author":"Declercq","year":"2015","journal-title":"Epidemiology"},{"key":"10.1016\/j.ajog.2017.04.025_bib32","first-page":"480","article-title":"Birth outcomes by infertility diagnosis: analyses of the Massachusetts Outcomes Study of Assisted Reproductive Technologies (MOSART)","volume":"60","author":"Luke","year":"2015","journal-title":"J\u00a0Reprod Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib33","doi-asserted-by":"crossref","first-page":"e20152007","DOI":"10.1542\/peds.2015-2007","article-title":"Assisted reproductive technology and early intervention enrollment","volume":"137","author":"Diop","year":"2016","journal-title":"Pediatrics"},{"key":"10.1016\/j.ajog.2017.04.025_bib34","doi-asserted-by":"crossref","first-page":"527","DOI":"10.1097\/AOG.0000000000001292","article-title":"Severe maternal morbidity and the use of assisted reproductive technology","volume":"127","author":"Belanoff","year":"2016","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib35","first-page":"114","article-title":"Birth outcomes by infertility treatment: analyses of the Massachusetts Outcomes Study of Assisted Reproductive Technologies (MOSART)","volume":"61","author":"Luke","year":"2016","journal-title":"J\u00a0Reprod Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib36","doi-asserted-by":"crossref","first-page":"717","DOI":"10.1016\/j.fertnstert.2016.04.042","article-title":"Validation of birth outcomes in the SART CORS: population-based analysis from the Massachusetts Outcome Study of Assisted Reproductive Technology (MOSART)","volume":"106","author":"Stern","year":"2016","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib37","doi-asserted-by":"crossref","first-page":"1203","DOI":"10.1007\/s10815-016-0757-6","article-title":"Perinatal outcomes of singleton siblings: the effects of maternal fertility status and ART treatment","volume":"33","author":"Luke","year":"2016","journal-title":"J\u00a0Assist Reprod Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib38","article-title":"Pregnancy, birth, and infant outcomes by maternal fertility status: the Massachusetts Outcomes Study of Assisted Reproductive Technology","author":"Luke","year":"2017","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib39","doi-asserted-by":"crossref","first-page":"541","DOI":"10.1016\/j.fertnstert.2016.05.026","article-title":"Society for Assisted Reproductive Technology and assisted reproductive technology in the United States: a 2016 update","volume":"106","author":"Toner","year":"2016","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib40","series-title":"2012 Assisted reproductive technology success rates: national summary and fertility clinic reports","year":"2014"},{"key":"10.1016\/j.ajog.2017.04.025_bib41","doi-asserted-by":"crossref","first-page":"6","DOI":"10.1186\/1471-2431-3-6","article-title":"A\u00a0nearly continuous measure of birth weight for gestational age using a United States national reference","volume":"3","author":"Oken","year":"2003","journal-title":"BMC Pediatr"},{"key":"10.1016\/j.ajog.2017.04.025_bib42","doi-asserted-by":"crossref","first-page":"2638","DOI":"10.1093\/humrep\/del246","article-title":"How should we report on perinatal outcome?","volume":"21","author":"Land","year":"2006","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib43","doi-asserted-by":"crossref","first-page":"702","DOI":"10.1093\/aje\/kwh090","article-title":"A\u00a0modified Poisson regression approach to prospective studies with binary data","volume":"159","author":"Zou","year":"2004","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.ajog.2017.04.025_bib44","doi-asserted-by":"crossref","first-page":"3007","DOI":"10.1093\/humrep\/det354","article-title":"Physician recommendation for invasive prenatal testing: the case of the \u201cprecious baby\u201d","volume":"28","author":"Srebnik","year":"2013","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib45","doi-asserted-by":"crossref","first-page":"607","DOI":"10.1097\/01.AOG.0000174585.08884.59","article-title":"The myth of the precious baby","volume":"106","author":"Minkoff","year":"2005","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib46","doi-asserted-by":"crossref","first-page":"1077","DOI":"10.1016\/S0015-0282(97)81442-2","article-title":"Is the obstetric outcome of in\u00a0vitro fertilized singleton gestations different from natural ones? A controlled study","volume":"67","author":"Reubinoff","year":"1997","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib47","doi-asserted-by":"crossref","first-page":"184","DOI":"10.1111\/j.1523-536X.2010.00405.x","article-title":"Population-based study of cesarean section after in\u00a0vitro fertilization in Australia","volume":"37","author":"Sullivan","year":"2010","journal-title":"Birth"},{"key":"10.1016\/j.ajog.2017.04.025_bib48","doi-asserted-by":"crossref","first-page":"261","DOI":"10.1136\/bmj.37957.560278.EE","article-title":"Perinatal outcome of singletons and twins after assisted conception: a systematic review of controlled studies","volume":"328","author":"Helmerhorst","year":"2004","journal-title":"BMJ"},{"key":"10.1016\/j.ajog.2017.04.025_bib49","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/j.ajog.2004.11.064","article-title":"Perinatal outcomes of in\u00a0vitro fertilization twins: a systematic review and meta-analyses","volume":"193","author":"McDonald","year":"2005","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib50","doi-asserted-by":"crossref","first-page":"2321","DOI":"10.1093\/humrep\/dep173","article-title":"Twins born following assisted reproductive technology: perinatal outcome and admission to hospital","volume":"24","author":"Hansen","year":"2009","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib51","doi-asserted-by":"crossref","first-page":"517","DOI":"10.1007\/s10995-007-0202-7","article-title":"A\u00a0population-based study of maternal and perinatal outcomes associated with assisted reproductive technology in Massachusetts","volume":"11","author":"Schieve","year":"2007","journal-title":"Matern Child Health J"},{"key":"10.1016\/j.ajog.2017.04.025_bib52","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.ejogrb.2013.12.011","article-title":"Maternal and perinatal outcomes in spontaneous versus assisted conception twin pregnancies","volume":"174","author":"Castera","year":"2014","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"10.1016\/j.ajog.2017.04.025_bib53","doi-asserted-by":"crossref","first-page":"S91","DOI":"10.1016\/j.ajog.2015.06.054","article-title":"Anomalies of the placenta and umbilical cord in twin gestations","volume":"213","author":"Hubinont","year":"2015","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib54","doi-asserted-by":"crossref","first-page":"2763","DOI":"10.1093\/humrep\/dem191","article-title":"Umbilical cord anomalies are more frequent in twins after assisted conception","volume":"22","author":"Delbaere","year":"2007","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib55","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1375\/twin.9.2.279","article-title":"Pregnancy outcome among twins conceived after subfertility treatment compared with natural twins: a population-based study","volume":"9","author":"Murphy","year":"2006","journal-title":"Twin Res Hum Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib56","doi-asserted-by":"crossref","first-page":"1941","DOI":"10.1093\/humrep\/den169","article-title":"Perinatal outcomes of twin births conceived using assisted reproduction technology: a population-based study","volume":"23","author":"Boulet","year":"2008","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib57","doi-asserted-by":"crossref","first-page":"458","DOI":"10.3109\/14767058.2013.818653","article-title":"Comparison of outcomes of twins conceived spontaneously and by artificial reproductive therapy","volume":"27","author":"Anbazhagan","year":"2014","journal-title":"J\u00a0Matern Fetal Neonatal Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib58","doi-asserted-by":"crossref","first-page":"1003","DOI":"10.1056\/NEJM196411052711908","article-title":"Inheritance in human dizygotic twinning","volume":"271","author":"White","year":"1964","journal-title":"N\u00a0Engl J Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib59","first-page":"4","article-title":"Epidemiology of twin pregnancy","volume":"10","author":"MacGillivray","year":"1986","journal-title":"Semin Perinatol"},{"key":"10.1016\/j.ajog.2017.04.025_bib60","series-title":"The biology of twinning","author":"Bulmer","year":"1970"},{"key":"10.1016\/j.ajog.2017.04.025_bib61","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1375\/twin.10.2.385","article-title":"A\u00a0retrospective analysis of placentas from twin pregnancies derived from assisted reproductive technology","volume":"10","author":"Chan","year":"2007","journal-title":"Twin Res Hum Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib62","first-page":"45","article-title":"The risk of monozygotic twins after assisted reproductive technology: a systematic review and meta-analysis","volume":"15","author":"Vitthala","year":"2009","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib63","doi-asserted-by":"crossref","first-page":"825","DOI":"10.1016\/j.fertnstert.2011.11.048","article-title":"Multiple gestation associated with infertility therapy: an American Society for Reproductive Medicine practice committee opinion","volume":"97","year":"2012","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib64","doi-asserted-by":"crossref","first-page":"2966","DOI":"10.1093\/humrep\/des258","article-title":"Factors associated with dizygotic twinning after IVF treatment with double embryo transfer","volume":"27","author":"Groeneveld","year":"2012","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib65","doi-asserted-by":"crossref","first-page":"757","DOI":"10.7863\/jum.2001.20.7.757","article-title":"Frequency of a monochorionic pair in multiple gestations: relationship to mode of conception","volume":"20","author":"Chow","year":"2001","journal-title":"J\u00a0Ultrasound Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib66","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1111\/j.1479-828X.2005.00451.x","article-title":"Is there increased risk of monozygotic twinning after assisted reproductive technology?","volume":"45","author":"Toledo","year":"2005","journal-title":"Aust N Z J Obstet Gynaecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib67","doi-asserted-by":"crossref","first-page":"1366","DOI":"10.1093\/humrep\/den045","article-title":"Risk factors associated with pregnancies containing a monochorionic pair following assisted reproductive technologies","volume":"23","author":"Skiadas","year":"2008","journal-title":"Hum Reprod"},{"key":"10.1016\/j.ajog.2017.04.025_bib68","doi-asserted-by":"crossref","first-page":"683","DOI":"10.1016\/j.fertnstert.2013.11.034","article-title":"Factors associated with monozygosity in assisted reproductive technology (ART) pregnancies and the risk of recurrence using linked cycles","volume":"101","author":"Luke","year":"2014","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib69","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1016\/j.fertnstert.2014.03.039","article-title":"What makes them split? Identifying risk factors that lead to monozygotic twins after in\u00a0vitro fertilization","volume":"102","author":"Knopman","year":"2014","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib70","doi-asserted-by":"crossref","first-page":"19","DOI":"10.1007\/s10815-015-0616-x","article-title":"Clustering of monozygotic twinning in IVF","volume":"33","author":"Vaughn","year":"2016","journal-title":"J\u00a0Assist Reprod Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib71","doi-asserted-by":"crossref","first-page":"803","DOI":"10.1007\/s10815-014-0225-0","article-title":"The incidence of monozygotic twinning in assisted reproductive technology: analysis based on results from the 2010 Japanese ART national registry","volume":"31","author":"Nakasuji","year":"2014","journal-title":"J\u00a0Assist Reprod Genet"},{"key":"10.1016\/j.ajog.2017.04.025_bib72","doi-asserted-by":"crossref","first-page":"716","DOI":"10.1016\/j.tjog.2015.06.011","article-title":"The day of embryo transfer affects delivery rate, birth weights, female-to-male ratio, and monozygotic rate","volume":"54","author":"Sotiroska","year":"2015","journal-title":"Taiwan J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib73","doi-asserted-by":"crossref","first-page":"511.e1","DOI":"10.1016\/j.ajog.2015.06.028","article-title":"Association between ovarian stimulators with and without intrauterine insemination, and assisted reproductive technologies on multiple births","volume":"213","author":"Chaabane","year":"2015","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib74","doi-asserted-by":"crossref","first-page":"731","DOI":"10.1016\/S0015-0282(01)01679-X","article-title":"Natural versus induced twinning and pregnancy outcome: a\u00a0Dutch nationwide survey of primiparous dizygotic twin deliveries","volume":"75","author":"Lambalk","year":"2001","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib75","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1016\/j.fertnstert.2016.03.042","article-title":"Dizygotic twin pregnancies after medically assisted reproduction and after natural conception: maternal and perinatal outcomes","volume":"106","author":"Bensdorp","year":"2016","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib76","doi-asserted-by":"crossref","first-page":"1803","DOI":"10.1056\/NEJMoa1008095","article-title":"Reproductive technologies and the risk of\u00a0birth\u00a0defects","volume":"366","author":"Davies","year":"2012","journal-title":"N\u00a0Engl J Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib77","doi-asserted-by":"crossref","first-page":"641.e1","DOI":"10.1016\/j.ajog.2015.11.003","article-title":"Severe acute maternal morbidity in multiple pregnancies: a nationwide cohort study","volume":"214","author":"Witteveen","year":"2016","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib78","first-page":"e131","article-title":"Multifetal gestations: twin, triplets, and higher-order multifetal pregnancies. Practice bulletin no. 169","volume":"128","year":"2016","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib79","doi-asserted-by":"crossref","first-page":"530","DOI":"10.1002\/uog.8956","article-title":"First-trimester ultrasound determination of chorionicity in twin pregnancy","volume":"38","author":"Dias","year":"2011","journal-title":"Ultrasound Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib80","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1016\/j.ejogrb.2016.04.023","article-title":"First-trimester ultrasound determination of chorionicity in twin gestations using the lambda sign: a systematic review and meta-analysis","volume":"202","author":"Maruotti","year":"2016","journal-title":"Eur J Obstet Gynecol Reprod Biol"},{"key":"10.1016\/j.ajog.2017.04.025_bib81","doi-asserted-by":"crossref","first-page":"1513","DOI":"10.1016\/S0140-6736(06)68651-0","article-title":"Effect of B vitamins and genetics on success of in-vitro fertilization: prospective cohort study","volume":"367","author":"Haggarty","year":"2006","journal-title":"Lancet"},{"key":"10.1016\/j.ajog.2017.04.025_bib82","doi-asserted-by":"crossref","first-page":"183","DOI":"10.1001\/jama.2016.19438","article-title":"Folic acid supplementation for the prevention of neural tube defects","volume":"317","year":"2017","journal-title":"JAMA"},{"key":"10.1016\/j.ajog.2017.04.025_bib83","doi-asserted-by":"crossref","first-page":"1304","DOI":"10.1093\/aje\/kwp052","article-title":"Association of periconceptional multivitamin use with reduced risk of preeclampsia among normal-weight women in the Danish National Birth Cohort","volume":"169","author":"Catov","year":"2009","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.ajog.2017.04.025_bib84","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1093\/oxfordjournals.aje.a009244","article-title":"Use of multivitamin\/mineral prenatal supplements: influence on the outcome of pregnancy","volume":"146","author":"Scholl","year":"1997","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.ajog.2017.04.025_bib85","doi-asserted-by":"crossref","first-page":"867","DOI":"10.1093\/aje\/kwm373","article-title":"Folic acid and multivitamin supplement use and risk of placental abruption: a population-based registry study","volume":"167","author":"Nilsen","year":"2008","journal-title":"Am J Epidemiol"},{"key":"10.1016\/j.ajog.2017.04.025_bib86","doi-asserted-by":"crossref","first-page":"e70380","DOI":"10.1371\/journal.pone.0070380","article-title":"Prevalence, risk factors and outcomes of velamentous and cord insertions: a population-based study of 634,741 pregnancies","volume":"8","author":"Ebbing","year":"2013","journal-title":"PLoS One"},{"key":"10.1016\/j.ajog.2017.04.025_bib87","first-page":"217","article-title":"Body mass index-specific weight gains associated with optimal birth weights in twin pregnancies","volume":"48","author":"Luke","year":"2003","journal-title":"J\u00a0Reprod Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib88","doi-asserted-by":"crossref","first-page":"1652","DOI":"10.3109\/14767058.2014.898058","article-title":"The association between maternal weight gain and spontaneous preterm birth in twin pregnancies","volume":"27","author":"Fox","year":"2014","journal-title":"J\u00a0Matern Fetal Neonatal Med"},{"key":"10.1016\/j.ajog.2017.04.025_bib89","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1038\/jp.2014.160","article-title":"The association of inadequate mid-pregnancy weight gain and preterm birth in twin pregnancies","volume":"35","author":"Pettit","year":"2015","journal-title":"J\u00a0Perinatol"},{"key":"10.1016\/j.ajog.2017.04.025_bib90","doi-asserted-by":"crossref","first-page":"585","DOI":"10.1097\/GRF.0000000000000117","article-title":"Nutrition for multiples","volume":"58","author":"Luke","year":"2015","journal-title":"Clin Obstet Gynecol"},{"key":"10.1016\/j.ajog.2017.04.025_bib91","doi-asserted-by":"crossref","first-page":"1657","DOI":"10.1016\/j.fertnstert.2009.10.059","article-title":"Accuracy of assisted reproductive technology information on the Massachusetts birth certificate, 1997-2000","volume":"94","author":"Zhang","year":"2010","journal-title":"Fertil Steril"},{"key":"10.1016\/j.ajog.2017.04.025_bib92","doi-asserted-by":"crossref","first-page":"571","DOI":"10.1089\/jwh.2013.4452","article-title":"States Monitoring Assisted Reproductive Technology (SMART) Collaborative: data collection, linkage, dissemination, and use","volume":"22","author":"Mneimneh","year":"2013","journal-title":"J\u00a0Womens Health (Larchmt)"}],"container-title":["American Journal of Obstetrics and Gynecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0002937817305549?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0002937817305549?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2025,9,11]],"date-time":"2025-09-11T11:16:34Z","timestamp":1757589394000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0002937817305549"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,9]]},"references-count":92,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2017,9]]}},"alternative-id":["S0002937817305549"],"URL":"https:\/\/doi.org\/10.1016\/j.ajog.2017.04.025","relation":{},"ISSN":["0002-9378"],"issn-type":[{"value":"0002-9378","type":"print"}],"subject":[],"published":{"date-parts":[[2017,9]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"Adverse pregnancy, birth, and infant outcomes in twins: effects of\u00a0maternal fertility status and infant gender combinations; the Massachusetts Outcomes Study of Assisted Reproductive Technology","name":"articletitle","label":"Article Title"},{"value":"American Journal of Obstetrics and Gynecology","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/j.ajog.2017.04.025","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"\u00a9 2017 Elsevier Inc. All rights reserved.","name":"copyright","label":"Copyright"}]}}