Betel chewing in ceylon.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000428:Alcohol Drinking; D001114:Areca; D002610:Cheek; D004493:Education; D004938:Esophageal Neoplasms / Q000209:etiology; D005260:Female; D006184:Habits; D006306:Health Surveys; D006801:Humans; D008297:Male; D008409:Mastication; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000209:etiology; D010946:Plants, Medicinal; D044469:Racial Groups; D012737:Sex Factors; D012907:Smoking; D013188:Sri Lanka; D011795:Surveys and Questionnaires