1. Department of Infectious Diseases, Peking University Third Hospital, Beijing, China
2. Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, and Beijing Key Laboratory of Emerging Infectious Diseases, Beijing, China
3. Department of Clinical Laboratory, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China
4. Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
5. Department of Medicine, University at Buffalo, State University of New York, Buffalo, NY, USA
6. Veterans Administration Western New York Healthcare System, Buffalo, New York, USA
7. Department of Pulmonary and Critical Care Medicine, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China