American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2018 > 218 > 2 > 254.e1-254.e7
American Journal of Obstetrics and Gynecology > 2018 > 218 > 3 > 341.e1-341.e9
American Journal of Obstetrics and Gynecology > 2018 > 218 > 6 > 614.e1-614.e8