1. Anal-Colorectal Surgery Institute, 150th Hospital of PLA, Luoyang, China
2. Department of Gastrointestine Surgery, Changzheng Hospital, Second Military Medical University, Shanghai, China
3. The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, China
4. Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
5. Department of Oncology, Changhai Hospital, Second Military Medical University, Shanghai, China
6. Department of Clinical Laboratory, 150th Hospital of PLA, Luoyang, China