{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T15:15:37Z","timestamp":1773155737596,"version":"3.50.1"},"reference-count":16,"publisher":"Elsevier BV","issue":"3","license":[{"start":{"date-parts":[[2005,3,1]],"date-time":"2005-03-01T00:00:00Z","timestamp":1109635200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[2005,3,1]],"date-time":"2005-03-01T00:00:00Z","timestamp":1109635200000},"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":[[2005,3]]},"DOI":"10.1016\/j.ajog.2004.05.057","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T19:43:45Z","timestamp":1109447025000},"page":"909-915","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":23,"title":["The cost of twin pregnancy: Maternal and neonatal factors"],"prefix":"10.1016","volume":"192","author":[{"given":"Barbara","family":"Luke","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Morton B.","family":"Brown","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierre K.","family":"Alexandre","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toyin","family":"Kinoshi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mary Jo","family":"O'Sullivan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dibe","family":"Martin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ruta B.","family":"Misiunas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Clark","family":"Nugent","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cosmas","family":"Van De Ven","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roger B.","family":"Newman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jill G.","family":"Mauldin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frank R.","family":"Witter","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"78","reference":[{"key":"10.1016\/j.ajog.2004.05.057_bib1","article-title":"Births: final data for 2002","volume":"Vol. 52, no.10","author":"Martin","year":"2003"},{"key":"10.1016\/j.ajog.2004.05.057_bib2","doi-asserted-by":"crossref","first-page":"229","DOI":"10.1016\/0029-7844(94)00354-G","article-title":"Increasing trends in plural births in the United States","volume":"85","author":"Jewell","year":"1995","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib3","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 vitro fertilization","volume":"282","author":"Schieve","year":"1999","journal-title":"JAMA"},{"key":"10.1016\/j.ajog.2004.05.057_bib4","doi-asserted-by":"crossref","first-page":"1159","DOI":"10.1542\/peds.111.S1.1159","article-title":"Trends in multiple births conceived using assisted reproductive technology, United States, 1997-2000","volume":"111","author":"Reynolds","year":"2003","journal-title":"Pediatrics"},{"key":"10.1016\/j.ajog.2004.05.057_bib5","doi-asserted-by":"crossref","first-page":"742","DOI":"10.1016\/S0002-9378(98)70075-4","article-title":"Outcomes of very low birth weight twins cared for in the National Institute of Child Health and Human Development Neonatal Research Network's intensive care units","volume":"179","author":"Donovan","year":"1998","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib6","doi-asserted-by":"crossref","first-page":"1632","DOI":"10.1016\/S0002-9378(98)70037-7","article-title":"Very low birth weight outcomes of the National Institute of Child Health and Human Development Neonatal Research Network, January 1993 through December 1994","volume":"179","author":"Stevenson","year":"1998","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib7","first-page":"129","article-title":"The changing epidemiology of multiple births in the United States","volume":"101","author":"Russell","year":"2003","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib8","first-page":"333","article-title":"Reducing fetal deaths in multiple births: optimal birthweights and gestational ages for infants of twin and triplet births","volume":"45","author":"Luke","year":"1996","journal-title":"Acta Genet Med Gemellol"},{"key":"10.1016\/j.ajog.2004.05.057_bib9","first-page":"57","article-title":"Causes and consequences of recent increases in preterm birth among twins","volume":"98","author":"Joseph","year":"2001","journal-title":"Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib10","doi-asserted-by":"crossref","first-page":"451","DOI":"10.1067\/mob.2001.109399","article-title":"Perinatal mortality and neonatal morbidity rates among twin pairs at different gestational ages: optimal delivery timing at 37 to 38 weeks' gestation","volume":"184","author":"Hartley","year":"2001","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib11","doi-asserted-by":"crossref","first-page":"1055","DOI":"10.1016\/S0002-9378(97)70014-0","article-title":"Critical periods of maternal weight gain: effect on twin birth weight","volume":"177","author":"Luke","year":"1997","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib12","doi-asserted-by":"crossref","first-page":"1155","DOI":"10.1016\/S0002-9378(98)70124-3","article-title":"The importance of early weight gain in the intrauterine growth and birth weight of twins","volume":"179","author":"Luke","year":"1998","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib13","doi-asserted-by":"crossref","first-page":"129","DOI":"10.1148\/radiology.181.1.1887021","article-title":"In utero analysis of fetal growth: a sonographic weight standard","volume":"181","author":"Hadlock","year":"1991","journal-title":"Radiology"},{"key":"10.1016\/j.ajog.2004.05.057_bib14","unstructured":"Bureau of Labor Statistics. US Department of Labor, Division of Consumer Prices and Price Index, 2003. http:\/\/www.bls.gov\/cpi."},{"key":"10.1016\/j.ajog.2004.05.057_bib15","doi-asserted-by":"crossref","first-page":"76","DOI":"10.1016\/0002-9378(87)90208-0","article-title":"Advanced ultrasonic placental maturation in twin pregnancies","volume":"156","author":"Ohel","year":"1987","journal-title":"Am J Obstet Gynecol"},{"key":"10.1016\/j.ajog.2004.05.057_bib16","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1016\/0002-9378(84)90716-6","article-title":"Fetal lung maturation in twin gestation","volume":"148","author":"Leveno","year":"1984","journal-title":"Am J Obstet Gynecol"}],"container-title":["American Journal of Obstetrics and Gynecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0002937804005411?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0002937804005411?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2025,9,11]],"date-time":"2025-09-11T09:57:44Z","timestamp":1757584664000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0002937804005411"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2005,3]]},"references-count":16,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2005,3]]}},"alternative-id":["S0002937804005411"],"URL":"https:\/\/doi.org\/10.1016\/j.ajog.2004.05.057","relation":{},"ISSN":["0002-9378"],"issn-type":[{"value":"0002-9378","type":"print"}],"subject":[],"published":{"date-parts":[[2005,3]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"The cost of twin pregnancy: Maternal and neonatal factors","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.2004.05.057","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"Copyright \u00a9 2005 Elsevier Inc. All rights reserved.","name":"copyright","label":"Copyright"}]}}