[X-ray diagnosis of early esophageal cancer--with special reference to the usefulness of mass screening].
D000367:Age Factors; D004724:Endoscopy; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging* / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D011859:Radiography; D012737:Sex Factors