1. Department of Digestive Disease, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China
2. Department of General Surgery, Jiyang People's Hospital, Jiyang, Shandong, China
3. Department of Medical Imaging, Jiyang People's Hospital, Jiyang, Shandong, China
4. Department of Anus & Intestine Surgery, Taian City Central Hospital, Taian, Shandong, China
5. Department of Surgical Oncology, The Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
6. Department of General Surgery, Jiangsu Cancer Hospital, The Affiliated Cancer Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
7. Department of Gastrointestinal Surgery, Linyi People's Hospital, Linyi, Shandong, China