1. Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
2. Department of Internal Medicine‑Oncology, Affiliated People's Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010020, P.R. China
3. Digestive Department, Affiliated People's Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010020, P.R. China