Media type: E-Article Title: Increasing rates of sex-discordant twins no longer correspond to decreasing perinatal mortality rates Contributor: Hartley, Rebecca S.; Hitti, Jane Published: Walter de Gruyter GmbH, 2008 Published in: Journal of Perinatal Medicine, 36 (2008) 3 Language: Not determined DOI: 10.1515/jpm.2008.017 ISSN: 0300-5577; 1619-3997 Keywords: Obstetrics and Gynecology ; Pediatrics, Perinatology and Child Health Origination: Footnote: