American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2004 > 191 > 2 > 537-541
American Journal of Obstetrics and Gynecology > 2004 > 191 > 3 > 954-957
American Journal of Obstetrics and Gynecology > 2004 > 191 > 3 > 928-932