Diagnosis, screening and follow-up of gastrointestinal cancer.
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D000375:Aging; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D008403:Mass Screening / Q000191:economics; D011230:Precancerous Conditions / Q000175:diagnosis* / Q000628:therapy; D012307:Risk Factors