title: Recurrent herpes labialis, recurrent aphthous ulcers, and the menstrual cycle.
mesh_terms: D003276:Contraceptives, Oral / Q000494:pharmacology; D005260:Female; D006560:Herpes Labialis / Q000453:epidemiology*; D006801:Humans; D008598:Menstruation; D012008:Recurrence; D013223:Statistics as Topic; D013281:Stomatitis, Aphthous / Q000453:epidemiology*; D013338:Students, Nursing
chemical_list: D003276:Contraceptives, Oral