1 Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China.
2 Central and Clinical Laboratory of Sanya People's Hospital, Sanya, Hainan, China.
3 West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, China.
4 Department of Laboratory Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China.