1. Department of General Surgery, Guangzhou Red Cross Hospital, Medical College, Jinan University, Guangzhou, China
2. Surgical Department, Guang’anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
3. The Second General Surgery Department for Carcinoma, First People’s Hospital of Chenzhou, Southern Medical University, Chenzhou, China
4. Department of Colorectal Surgery, The 940th Hospital of Joint Logistics Support Force of Chinese People’s Liberation Army, Lanzhou, China