American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2013 > 208 > 1 > 79.e1-79.e7
American Journal of Obstetrics and Gynecology > 2013 > 208 > 2 > 148.e1-148.e7
American Journal of Obstetrics and Gynecology > 2013 > 208 > 5 > 360-365