1. Department of General Surgery, ChengDu XinHua Hospital, ChengDu, Sichuan Province, China;
2. Department of Radiology, The General Hospital of Western Theater Command, ChengDu, Sichuan Province, China;
3. Depaartment of Medical Management, The General Hospital of Western Theater Command, ChengDu, Sichuan Province, China;
4. Center of General Surgery, The General Hospital of Western Theater Command, ChengDu, Sichuan Province, China