American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2017 > 216 > 1 > 66.e1-66.e7
American Journal of Obstetrics and Gynecology > 2017 > 216 > 3 > 306.e1-306.e12
American Journal of Obstetrics and Gynecology > 2017 > 216 > 4 > 401.e1-401.e8