[1] Zhengzhou Univ, Henan Canc Hosp, Dept Gastrointestinal Med Oncol, Affiliated Canc Hosp, Zhengzhou, Peoples R China
[2] Zhengzhou Univ, Henan Canc Hosp, Dept Med Oncol, Affiliated Canc Hosp, Zhengzhou, Peoples R China
[3] Shanghai Jiao Tong Univ, Renji Hosp, Sch Med, Dept Oncol, Shanghai, Peoples R China