1. Department of Respiratory and Critical Care Medicine, Beijing Youan Hospital, Capital Medical University, Beijing, China.
2. Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing, China.
3. Beijing Key Laboratory for HIV/AIDS Research, Clinical and Research Center for Infectious Diseases, Beijing Youan Hospital, Capital Medical University, Beijing, China.
4. Laboratory for Clinical Medicine, Capital Medical University, Beijing, China.
5. Beijing Research Center for Respiratory Infectious Diseases, Beijing, China.