1. Department of Oncology, Nantong Tumor Hospital, Nantong, Jiangsu 226300, P.R. China
2. Department of Pathology, Nantong Tumor Hospital, Nantong, Jiangsu 226300, P.R. China
3. Department of Oncology, Haimen People's Hospital, Nantong, Jiangsu 226100, P.R. China
4. Department of General Surgery, Nantong Tumor Hospital, Nantong, Jiangsu 226300, P.R. China
5. Department of General Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China