{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,1,31]],"date-time":"2024-01-31T09:36:17Z","timestamp":1706693777294},"reference-count":23,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2010,4,15]],"date-time":"2010-04-15T00:00:00Z","timestamp":1271289600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reprod Medicine &amp; Biology"],"published-print":{"date-parts":[[2010,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We report two extremely rare cases in which the patients delivered male and female infants that were dizygotic twins (DZT) despite single embryo transfer. <jats:italic>Case 1<\/jats:italic>: The patient was a 35\u2010year\u2010old woman with a 9\u2010year history of unexplained infertility. In an oocyte retrieval cycle, one blastocyst was transferred; at 26 weeks of gestation, she delivered a 704\u2010g female infant and a 420\u2010g male infant by cesarean section. Because both infants were of extremely low birth weight, they were placed in the neonatal intensive care unit. Congenital anomalies were not found in either infant. <jats:italic>Case 2<\/jats:italic>: The patient was a 30\u2010year\u2010old woman with a 1\u2010year history of infertility. Hysterosalpingogram revealed bilateral tubal occlusion. In a frozen\/thawed cycle one blastocyst was transferred during her natural ovulation cycle. She achieved a pregnancy and delivered a 2,877\u2010g female infant and a 2,544\u2010g male infant at 36 weeks of gestation by cesarean section. The female infant was diagnosed with a neural tube defect. No congenital anomalies were detected in the male infant. We hypothesize that the DZTs might have been the result of concurrent embryo transfer and natural ovulation and intercourse.<\/jats:p>","DOI":"10.1007\/s12522-010-0048-3","type":"journal-article","created":{"date-parts":[[2010,4,14]],"date-time":"2010-04-14T05:37:26Z","timestamp":1271223446000},"page":"169-172","source":"Crossref","is-referenced-by-count":7,"title":["Sex\u2010discordant twins despite single embryo transfer: a report of two cases"],"prefix":"10.1002","volume":"9","author":[{"given":"Nobuo","family":"Sugawara","sequence":"first","affiliation":[{"name":"Iwaki Women's Clinic  3\u20102 Okishita, Uchigo 973\u20108403 Iwaki Fukushima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideyuki","family":"Fukuchi","sequence":"additional","affiliation":[{"name":"Fukuchi Ladies\u2019 Clinic  2\u201017\u20104 Kashimamachi 317\u20100071 Hitachi Ibaraki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Machiko","family":"Maeda","sequence":"additional","affiliation":[{"name":"Iwaki Women's Clinic  3\u20102 Okishita, Uchigo 973\u20108403 Iwaki Fukushima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rie","family":"Komaba","sequence":"additional","affiliation":[{"name":"Iwaki Women's Clinic  3\u20102 Okishita, Uchigo 973\u20108403 Iwaki Fukushima Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuhisa","family":"Araki","sequence":"additional","affiliation":[{"name":"The Institute for ARMT  909\u201021 Ishii, Fujimi 371\u20100105 Maebashi Gunma Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2010,4,15]]},"reference":[{"key":"e_1_2_3_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/humrep\/deh744"},{"key":"e_1_2_3_3_1","unstructured":"Japan Society of Obstetrics and Gynecology. 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