1. Wuhan Iron & Steel Corporation (WISCO) Worker's Hospital (Huarun-WISCO Hospital), Baiyushan Street, Qingshan District, Wuhan 430085, China
2. Beijing Shijitan Hospital, Capital Medical University, No.10 Tieyi Road, Haidian District, Beijing 100020, China
3. The National Clinical Key Department of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, No. 8 Jingshun East Street, Chaoyang District, Beijing 100015, China