[Some problems on populizing emergency contraception in clinic].
Cheng
Li-nan
LN
D003267:Contraception / Q000379:methods*; D003281:Contraceptives, Postcoital / Q000008:administration & dosage*; D004630:Emergencies; D005260:Female; D006801:Humans; D011247:Pregnancy
D003281:Contraceptives, Postcoital