American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2014 > 210 > 2 > 157.e1-157.e6
American Journal of Obstetrics and Gynecology > 2014 > 211 > 2 > 163.e1-163.e6
American Journal of Obstetrics and Gynecology > 2014 > 211 > 5 > 494.e1-494.e5