Concurrent cancer of the esophagus in Japan.
D000328:Adult; D000367:Age Factors; D000368:Aged; D004938:Esophageal Neoplasms / Q000150:complications / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000453:epidemiology*; D012744:Sex Ratio