[Study of multiple gastric cancer].
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging* / Q000453:epidemiology; D011856:Radiographic Image Enhancement; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging* / Q000453:epidemiology; D013997:Time Factors