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Capital Med Univ, Beijing Friendship Hosp, Natl Clin Res Ctr Digest Dis, Beijing Digest Dis Ctr,Beijing Key Lab Precancerou, Beijing, Peoples R China
Capital Med Univ, Beijing Friendship Hosp, Dept Gastroenterol, Beijing Key Lab Precancerous Les Digest Dis, Beijing 100050, Peoples R China Capital Med Univ, Beijing Friendship Hosp, Natl Clin Res Ctr Digest Dis, Beijing Digest Dis Ctr,Beijing Key Lab Precancerou, Beijing, Peoples R China