American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2005 > 192 > 5 > 1573-1577
American Journal of Obstetrics and Gynecology > 2007 > 197 > 1 > 101.e1-101.e6
American Journal of Obstetrics and Gynecology > 2007 > 197 > 6 > 622.e1-622.e7