title: A study of women on the progestogen only pill.
mesh_terms: D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects*; D008875:Middle Aged; D045167:Progesterone Congeners / Q000494:pharmacology*
chemical_list: D003276:Contraceptives, Oral; D045167:Progesterone Congeners