[1] Chongqing Med Univ, Affiliated Hosp 1, Dept Obstet & Gynecol, Chongqing 400016, Peoples R China
[2] Chongqing Med Univ, Affiliated Hosp 1, Dept Gastrointestinal Surg, Chongqing 400016, Peoples R China
[3] Chongqing Med Univ, Affiliated Hosp 1, Jinshan Hosp, Dept Pathol, Chongqing 401122, Peoples R China
[4] Chongqing Med Univ, Fac Basic Med, Dept Pathol, Chongqing 400016, Peoples R China