American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2005 > 193 > 4 > 1344-1352
American Journal of Obstetrics and Gynecology > 2008 > 198 > 4 > 457.e1-457.e6
American Journal of Obstetrics and Gynecology > 2009 > 200 > 3 > 296.e1-296.e9
American Journal of Obstetrics and Gynecology > 2011 > 204 > 6 > 531.e1-531.e7