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Capital Med Univ, Beijing Key Lab Precancerous Les Digest Dis, Natl Clin Res Ctr Digest Dis,Dept Gastroenterol, Beijing Friendship Hosp,Beijing Digest Dis Ctr, Yongan Rd 95, Beijing 100050, Peoples R China Capital Med Univ, Beijing Key Lab Precancerous Les Digest Dis, Natl Clin Res Ctr Digest Dis,Dept Gastroenterol, Beijing Friendship Hosp,Beijing Digest Dis Ctr, Yongan Rd 95, Beijing 100050, Peoples R China