1. Department of Colorectal and Anal Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, P.R. China
2. Department of Colorectal Surgery, The PLA Rocket Force Characteristic Medical Centre, Beijing, P.R. China
3. Department of Colorectal Surgery, Xuzhou Central Hospital, Jiangsu, P.R. China
4. General Surgery Department, Affiliated Hospital to Medical College of Jiaying University, Meizhou, Guangdong, P.R. China
5. Department of Colorectal Surgery, Jingmen No.1 Peolple’s Hospital, Jinmen, Hubi, P.R. China
6. Department of Colorectal Surgery, The Second People's Hospital of Yichang, Three Gorges University, Hubei, P.R. China
7. Department of Colorectal Surgery, Jingzhou Central Hospital, Jingzhou, Hubi, P.R. China
8. General Surgery Department, Gongan County People’s Hospital, Gongan County, Jingzhou, Hubi, P.R. China
9. Department of Colorectal Surgery, Yichang Central Hospital, Hubei, P.R. China
10. General Surgery Department, Tongshan County People’s Hospital, Tongshan County, Xianning, Hubi, P.R. China