小剂量米非司酮联合甲氨蝶呤经前4 d口服用于紧急避孕的研究
소제량미비사동연합갑안접령경전4 d구복용우긴급피잉적연구
Emergency contraception study of the small dose of mifepristone combining with MTX before 4 days in premenstruation
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