1. Department of Gastroenterology and Hepatology; First Affiliated Hospital; Sun Yat-sen University; Guangzhou; Guangdong Province; China
2. Guangzhou First Municipal People's Hospital; Guangzhou; Guangdong Province; China
3. Union Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan; Hubei Province; China
4. Peking University First Hospital; Beijing; China
5. Renji Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai; China
6. Ruijin Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai; China
7. Peking University Third Hospital; Beijing; China
8. Department of Biostatistic; Fudan University; Shanghai; China