title: [Epidemiological investigation on malignant nasopharyngeal tumor in Japan].
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000453:epidemiology* / Q000473:pathology; D012737:Sex Factors