Endoscopic diagnosis of early oesophageal carcinoma.
D000328:Adult; D000368:Aged; D002278:Carcinoma in Situ / Q000175:diagnosis / Q000517:prevention & control; D002681:China; D004938:Esophageal Neoplasms / Q000175:diagnosis* / Q000517:prevention & control; D004945:Esophagoscopy; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D008875:Middle Aged