American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1995 > 173 > 4 > 1030-1035
American Journal of Obstetrics and Gynecology > 2000 > 183 > 5 > 1114-1118
American Journal of Obstetrics and Gynecology > 2005 > 192 > 5 > 1469-1471