American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2013 > 208 > 3 > 176-180
American Journal of Obstetrics and Gynecology > 2013 > 208 > 4 > 255-259
American Journal of Obstetrics and Gynecology > 2013 > 208 > 3 > 176-180
American Journal of Obstetrics and Gynecology > 2013 > 208 > 4 > 255-259