[1] Sichuan University,Department of Abdominal Oncology, West China Hospital of Medicine
[2] Naval Medical University,Department of Colorectal Surgery, Changhai Hospital
[3] Sun Yat-sen University Cancer Center,Department of Colorectal Surgery
[4] Liaoning Cancer Hospital & Institute,Department of colorectal surgery, Cancer Hospital of China Medical University
[5] Sichuan University,Department of Gastrointestinal Surgery, West China Hospital of Medicine