American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2017 > 216 > 1 > 60.e1-60.e17
American Journal of Obstetrics and Gynecology > 2017 > 216 > 3 > 283.e1-283.e14
American Journal of Obstetrics and Gynecology > 2017 > 217 > 4 > 443.e1-443.e11