[Analysis of a survey on leukoplakia of the oral mucosa in 58,850 persons in Tianjin].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002681:China; D005260:Female; D006801:Humans; D007972:Leukoplakia, Oral / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D012907:Smoking