[1] Zhengzhou Univ, Dept Gastroenterol, Affiliated Hosp 1, Zhengzhou 450052, Peoples R China
[2] Zhengzhou Univ, State Key Lab Esophageal Canc Prevent & Treatment, Zhengzhou 450052, Peoples R China
[3] Zhengzhou Univ, Affiliated Hosp 1, Dept Pathol, Zhengzhou 450052, Peoples R China
[4] Zhengzhou Univ, Henan Univ, Henan Prov Peoples Hosp, Dept Pathol,Peoples Hosp, Zhengzhou 450003, Peoples R China
[5] Zhengzhou Univ, Affiliated Hosp 2, Dept Cerebrovasc Dis, Zhengzhou 450000, Peoples R China