Oral cancer incidence in central and western Canada.
D002170:Canada; D006801:Humans; D007971:Leukoplakia / Q000150:complications; D009059:Mouth Diseases / Q000150:complications; D009062:Mouth Neoplasms / Q000453:epidemiology*; D012424:Rural Population; D012737:Sex Factors; D012907:Smoking; D014505:Urban Population