[Survey of oral leukoplakia in patients with epithelial hyperplasia of the esophagus].
D000328:Adult; D000368:Aged; D004947:Esophagus / Q000473:pathology*; D005260:Female; D006801:Humans; D006965:Hyperplasia; D007972:Leukoplakia, Oral / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D012907:Smoking