1. Department of Infectious Diseases and Clinical Microbiology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China.
2. Beijing Institute of Respiratory Medicine, Beijing, People's Republic of China.
3. Beijing Key Laboratory of Respiratory and Pulmonary Circulation, Beijing, People's Republic of China.
4. Department of Clinical Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, People's Republic of China.