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Univ Nottingham Hosp, Queens Med Ctr, Wolfson Digest Dis Ctr, Div Gastrointestinal Surg, Nottingham NG7 2UH, England Univ Nottingham Hosp, Queens Med Ctr, Wolfson Digest Dis Ctr, Div Gastrointestinal Surg, Nottingham NG7 2UH, England