[Multiple primary malignancies of the head and neck].
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004067:Digestive System Neoplasms / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D005773:Gastroscopy; D006258:Head and Neck Neoplasms / Q000453:epidemiology*; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000453:epidemiology*; D012737:Sex Factors