1. Department of Oncology, The Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing, Jiangsu 211000, P.R. China
2. Department of Oncology, Dafeng People's Hospital, Yancheng, Jiangsu 224000, P.R. China
3. Department of General Surgery, The Affiliated Jiangning Hospital with Nanjing Medical University, Nanjing, Jiangsu 211000, P.R. China