American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2013 > 208 > 1 > 19-30
American Journal of Obstetrics and Gynecology > 2013 > 208 > 1 > 81.e1-81.e9
American Journal of Obstetrics and Gynecology > 2013 > 208 > 6 > 449.e1-449.e6