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机构:
Cleveland Clin, Digest Dis & Surg Inst, London SW1X 7HY, England
Univ Coll London Hosp UCLH, Dept Gastroenterol, London NW1 2BU, England
UCL, Rayne Inst, Ctr Obes Res, Dept Med, London NW1 2BU, England IRCCS Azienda Osped Univ Bologna, Gastroenterol Unit, I-40138 Bologna, Italy