American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2017 > 217 > 1 > 37-41
American Journal of Obstetrics and Gynecology > 2017 > 217 > 2 > 181.e1-181.e7
American Journal of Obstetrics and Gynecology > 2017 > 217 > 3 > 342.e1-342.e8