{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T16:18:32Z","timestamp":1786119512752,"version":"build-2736575974"},"reference-count":22,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Obstetrics &amp; Gynecology"],"published-print":{"date-parts":[[2004,2]]},"DOI":"10.1097\/01.aog.0000109427.85586.71","type":"journal-article","created":{"date-parts":[[2010,11,12]],"date-time":"2010-11-12T02:11:11Z","timestamp":1289527871000},"page":"327-332","source":"Crossref","is-referenced-by-count":35,"title":["The Association Between Fetal Sex and Preterm Birth in Twin Pregnancies"],"prefix":"10.1097","volume":"103","author":[{"given":"Hongzhuan","family":"Tan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shi Wu","family":"Wen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Walker","family":"Mark","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen Fung Kee","family":"Fung","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kitaw","family":"Demissie","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"George G.","family":"Rhoads","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","reference":[{"key":"R1-18-20160304","doi-asserted-by":"crossref","first-page":"1020","DOI":"10.1016\/S0029-7844(02)02212-3","volume":"100","author":"Goldenberg","year":"2002","journal-title":"Obstet Gynecol"},{"key":"R2-18-20160304","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1080\/01443610020022122","volume":"21","author":"Mesleh","year":"2001","journal-title":"J Obstet Gynecol"},{"key":"R3-18-20160304","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1016\/S0378-3782(98)00052-8","volume":"53","author":"Hack","year":"1999","journal-title":"Early Hum Dev"},{"key":"R4-18-20160304","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1002\/mrdd.10047","volume":"8","author":"Alexander","year":"2002","journal-title":"Ment Retard Dev Disabil Res Rev"},{"key":"R5-18-20160304","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1016\/S0020-7292(02)00147-9","volume":"78","author":"Roberts","year":"2002","journal-title":"Int J Gynaecol Obstet"},{"key":"R6-18-20160304","first-page":"514","volume":"21","author":"Challis","year":"2000","journal-title":"Endocr Rev"},{"key":"R7-18-20160304","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1055\/s-2007-994668","volume":"9","author":"Mcgregor","year":"1992","journal-title":"Am J Perinatol"},{"key":"R8-18-20160304","doi-asserted-by":"crossref","first-page":"2891","DOI":"10.1093\/humrep\/14.11.2891","volume":"14","author":"Astolfi","year":"1999","journal-title":"Hum Reprod"},{"key":"R9-18-20160304","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1016\/0029-7844(96)00106-8","volume":"88","author":"Cooperstock","year":"1996","journal-title":"Obstet Gynecol"},{"key":"R10-18-20160304","doi-asserted-by":"crossref","first-page":"2762","DOI":"10.1093\/humrep\/17.10.2762","volume":"17","author":"Zeitlin","year":"2002","journal-title":"Hum Reprod"},{"key":"R11-18-20160304","doi-asserted-by":"crossref","first-page":"762","DOI":"10.1016\/S0002-9378(98)70079-1","volume":"179","author":"Cooperstock","year":"1998","journal-title":"Am J Obstet Gynecol"},{"key":"R12-18-20160304","first-page":"1","author":"","year":"2000"},{"key":"R13-18-20160304","doi-asserted-by":"crossref","first-page":"1690","DOI":"10.1001\/jama.280.19.1690","volume":"280","author":"Zhang","year":"1998","journal-title":"JAMA"},{"key":"R14-18-20160304","author":"Rothman","year":"1998"},{"key":"R15-18-20160304","doi-asserted-by":"crossref","first-page":"560","DOI":"10.1016\/S0140-6736(01)05716-6","volume":"358","author":"Loos","year":"2001","journal-title":"Lancet"},{"key":"R16-18-20160304","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1002\/gepi.1370070406","volume":"7","author":"Hopper","year":"1990","journal-title":"Genet Epidemiol"},{"key":"R17-18-20160304","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1067\/mob.2002.121721","volume":"186","author":"Dube","year":"2002","journal-title":"Am J Obstet Gynecol"},{"key":"R18-18-20160304","doi-asserted-by":"crossref","first-page":"16","DOI":"10.1136\/bmj.2.6078.16","volume":"2","author":"Weekes","year":"1977","journal-title":"Br Med J"},{"key":"R19-18-20160304","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1002\/ajmg.1320550119","volume":"55","author":"Machin","year":"1995","journal-title":"Am J Med Genet"},{"key":"R20-18-20160304","doi-asserted-by":"crossref","first-page":"1203","DOI":"10.1111\/j.1471-0528.1997.tb10948.x","volume":"104","author":"Sebire","year":"1997","journal-title":"Br J Obstet Gynaecol"},{"key":"R21-18-20160304","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1375\/1369052012489","volume":"4","author":"Wade","year":"2001","journal-title":"Twin Res"},{"key":"R22-18-20160304","doi-asserted-by":"crossref","first-page":"650","DOI":"10.1097\/00006254-200010000-00025","volume":"55","author":"Challis","year":"2000","journal-title":"Obstet Gynecol Surv"}],"container-title":["Obstetrics &amp; Gynecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ovid.com\/00006250-200402000-00018","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T18:42:30Z","timestamp":1786041750000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ovid.com\/00006250-200402000-00018"}},"subtitle":[""],"short-title":[],"issued":{"date-parts":[[2004,2]]},"references-count":22,"journal-issue":{"issue":"2"},"URL":"https:\/\/doi.org\/10.1097\/01.aog.0000109427.85586.71","relation":{},"ISSN":["0029-7844"],"issn-type":[{"value":"0029-7844","type":"print"}],"subject":[],"published":{"date-parts":[[2004,2]]}}}