1. Department of Internal Medicine, The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China.
2. Senior Department of Infectious Diseases, the Fifth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Infectious Diseases, Beijing, China.
3. Department of Infectious Diseases, Tianjin Second People's Hospital, Tianjin, China.
4. Department of Gastroenterology, First Medical Center of Chinese PLA General Hospital, Beijing, China.
5. Department of Infectious Disease, Chongqing Public Health Medical Center, Chongqing, China.