Epidemiologic aspects of recurrent aphthous ulcerations.
D004812:Epidemiologic Methods; D005260:Female; D006560:Herpes Labialis / Q000453:epidemiology; D006801:Humans; D008297:Male; D012008:Recurrence; D013281:Stomatitis, Aphthous / Q000453:epidemiology* / Q000209:etiology