1. Department of Colorectal Surgery, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
2. Department of Colorectal Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
3. Department of Surgical Oncology, The First Affiliated Clinical Hospital of Qiqihaer Medical University, Qiqihaer, China
4. Follow Up Center, The Second Affiliated Hospital of Harbin Medical University, Harbin, China