American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2011 > 204 > 5 > 450.e15-450.e20
American Journal of Obstetrics and Gynecology > 2011 > 205 > 1 > 83.e1-83.e7
American Journal of Obstetrics and Gynecology > 2011 > 205 > 1 > 82.e15-82.e20
American Journal of Obstetrics and Gynecology > 2011 > 205 > 4 > 362.e1-362.e11