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American Journal of Obstetrics and Gynecology > 1999 > 181 > 4 > 862-866
International Journal of Gynecology and Obstetrics > 1995 > 49 > 3 > 265-269
American Journal of Obstetrics and Gynecology > 1999 > 181 > 4 > 862-866
International Journal of Gynecology and Obstetrics > 1995 > 49 > 3 > 265-269