1. The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
2. Xiehe Hospital, Fuzhou University, Fuzhou, China
3. Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
4. Xinhua Hospital, Shanghai Jiao Tong University, Shanghai, China
5. Xiehe Hospital, Huazhong University of Science and Technology, Wuhan, China
6. The First People's Hospital, Guangzhou City, Guangzhou, China
7. The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
8. The First People's Hospital, Foshan City, Foshan, China
9. Zhujiang Hospital, Nanfang University of Medical Science, Guangzhou, China
10. General Hospital, Guangdong Province, Guangzhou, China
11. Ruijin Hospital, Shanghai Jiao Tong University, Shanghai, China
12. General Hospital, Hunan Province, Changsha, China
13. The First Affiliated Hospital, Xiamen University, Xiamen, China
14. General Military Hospital, Guangzhou District, Guangzhou, China
15. Gastrointestinal Hospital, Sun Yatsen University, Guangzhou, China