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Zhengzhou Univ, Affiliated Hosp 1, Dept Gastroenterol, Zhengzhou 450000, Peoples R China
Southeast Univ, Zhongda Hosp, Sch Med, Dept Gastroenterol, Nanjing 210009, Peoples R China Zhengzhou Univ, Affiliated Hosp 1, Dept Gastroenterol, Zhengzhou 450000, Peoples R China