1. General Surgery Department, Affiliated Hospital/Clinical Medical College of Chengdu University, Chengdu, People's Republic of China
2. 2nd Affiliated Hospital of Jilin University, Changchun, People's Republic of China
3. Xuzhou Central Hospital, Xuzhou, People's Republic of China
4. Beijing Youan Hospital, Capital Medical University, Beijing, People's Republic of China
5. Hubei Cancer Hospital, Wuhan, People's Republic of China
6. Cancer Institute/Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, People's Republic of China