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机构:
Capital Med Univ, Dept Gastroenterol, Beijing Friendship Hosp,Beijing Key Lab Precancer, Natl Clin Res Ctr Digest Dis,Beijing Digest Dis C, Beijing 100050, Peoples R China Capital Med Univ, Dept Gastroenterol, Beijing Friendship Hosp,Beijing Key Lab Precancer, Natl Clin Res Ctr Digest Dis,Beijing Digest Dis C, Beijing 100050, Peoples R China