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机构:
Fourth Mil Med Univ, Xijing Hosp Digest Dis, Xian 710032, Peoples R China
Henan Univ Sci & Technol, Sanmenxia Cent Hosp, Dept Digest Dis, Sanmenxia 472000, Peoples R China Shenyang Mil Area, Gen Hosp, Dept Gastroenterol, Shenyang 110840, Peoples R China