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Capital Med Univ, Beijing Friendship Hosp, Natl Clin Res Ctr Digest Dis, Beijing Digest Dis Ctr,Beijing Key Lab Precancero, Beijing, Peoples R China Capital Med Univ, Beijing Friendship Hosp, Natl Clin Res Ctr Digest Dis, Beijing Digest Dis Ctr,Beijing Key Lab Precancero, Beijing, Peoples R China