American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2012 > 207 > 6 > 509.e1-509.e10
American Journal of Obstetrics and Gynecology > 2013 > 208 > 6 > 451.e1-451.e11
American Journal of Obstetrics and Gynecology > 2012 > 207 > 6 > 509.e1-509.e10
American Journal of Obstetrics and Gynecology > 2013 > 208 > 6 > 451.e1-451.e11