American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2013 > 208 > 5 > 380.e1-380.e8
American Journal of Obstetrics and Gynecology > 2013 > 208 > 5 > 390.e1-390.e6
American Journal of Obstetrics and Gynecology > 2013 > 209 > 2 > 121.e1-121.e11