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Qingdao Univ, Qingdao Med Coll, Affiliated Hosp, Dept Gastroenterol, Qingdao 266003, Shandong Prov, Peoples R China Qingdao Univ, Qingdao Med Coll, Affiliated Hosp, Dept Gastroenterol, Qingdao 266003, Shandong Prov, Peoples R China