[Mass screening and periodic examination of gastric cancer].
D003951:Diagnostic Errors; D006801:Humans; D008403:Mass Screening; D010437:Peptic Ulcer / Q000000981:diagnostic imaging; D011127:Polyps / Q000000981:diagnostic imaging; D011859:Radiography; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging*; D013276:Stomach Ulcer / Q000000981:diagnostic imaging