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American Journal of Obstetrics and Gynecology > 1998 > 179 > 3 > 583-585
Contraception > 1997 > 56 > 5 > 305-312
American Journal of Obstetrics and Gynecology > 1998 > 179 > 3 > 583-585
Contraception > 1997 > 56 > 5 > 305-312