Effects of certain 19-nor steroids on the normal human menstrual cycle.
D005260:Female; D006801:Humans; D008597:Menstrual Cycle; D008598:Menstruation / Q000187:drug effects*; D013256:Steroids / Q000494:pharmacology*
D013256:Steroids
MENSTRUATION/effect of drugs on; STEROIDS/effects