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Chinese Peoples Liberat Army Gen Hosp, Med Ctr 2, Dept Gastroenterol, Beijing 100853, Peoples R China
Chinese Peoples Liberat Army Gen Hosp, Natl Clin Res Ctr Geriatr Dis, Beijing 100853, Peoples R China Chinese Peoples Liberat Army Gen Hosp, Med Ctr 2, Dept Gastroenterol, Beijing 100853, Peoples R China