Emergency contraception: an unresolved issue.
Crisitina
C
Lopez-del Burgo
Rafael T
RT
Mikolajczyk
Joseph B
JB
Stanford
D044363:Contraception, Postcoital; D003281:Contraceptives, Postcoital / Q000494:pharmacology*; D005260:Female; D005306:Fertilization; D006801:Humans; D016912:Levonorgestrel / Q000494:pharmacology*; D010060:Ovulation / Q000187:drug effects
D003281:Contraceptives, Postcoital; D016912:Levonorgestrel