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American Journal of Obstetrics and Gynecology > 1999 > 180 > 1 > 91-94
American Journal of Obstetrics and Gynecology > 1998 > 178 > 3 > 594-599
American Journal of Obstetrics and Gynecology > 1999 > 180 > 1 > 91-94
American Journal of Obstetrics and Gynecology > 1998 > 178 > 3 > 594-599