American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2018 > 218 > 1 > 98-102
American Journal of Obstetrics and Gynecology > 2018 > 218 > 2(S) > S619-S629
American Journal of Obstetrics and Gynecology > 2018 > 218 > 4 > 438.e1-438.e16