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D003937:Diagnosis, Differential; D005767:Gastrointestinal Diseases / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D006801:Humans; D011379:Prognosis; D012307:Risk Factors