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Shanghai Jiao Tong Univ, Sch Med, Ctr Clin Epidemiol, Dept Gastroenterol,Shanghai Xinhua Hosp, Shanghai 200092, Peoples R China Shanghai Jiao Tong Univ, Sch Med, Ctr Clin Epidemiol, Dept Gastroenterol,Shanghai Xinhua Hosp, Shanghai 200092, Peoples R China