Frequency of oral submucous fibrosis in North India.
D000328:Adult; D000368:Aged; D006801:Humans; D007194:India; D007971:Leukoplakia / Q000453:epidemiology*; D008875:Middle Aged; D009059:Mouth Diseases / Q000453:epidemiology*; D009062:Mouth Neoplasms / Q000209:etiology*