title: [Is monthly menstruation necessary?].
authors.affiliation: HYKS:n naistenklinikka, HUS. oskari.heikinheimo@hus.fi
authors.forename: Oskari
authors.initials: O
authors.lastname: Heikinheimo
mesh_terms: D000293:Adolescent; D000328:Adult; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D005260:Female; D005387:Finland; D006801:Humans; D008597:Menstrual Cycle / Q000187:drug effects* / Q000502:physiology*; D008875:Middle Aged; D010507:Periodicity; D018570:Risk Assessment; D013997:Time Factors
chemical_list: D003277:Contraceptives, Oral, Combined