1. Department of Oncology, The Fifth Hospital of Wuhan, Wuhan, Hubei 430050, P.R. China
2. Department of Surgery, The Fifth Hospital of Wuhan, Wuhan, Hubei 430050, P.R. China
3. Department of Diagnostics, Medical College, Jianghan University, Wuhan, Hubei 430075, P.R. China
4. Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China