American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2017 > 216 > 2 > 168.e1-168.e9
American Journal of Obstetrics and Gynecology > 2017 > 216 > 3 > 281.e1-281.e7
American Journal of Obstetrics and Gynecology > 2017 > 216 > 6 > 606.e1-606.e10