1. School of Public Health, China Medical University, Shenyang, Liaoning province, People’s Republic of China
2. Chinese PLA Center for Disease Control and Prevention, Beijing, China
3. Department of Clinical Laboratory, Seventh Medical Center of Chinese PLA General Hospital, Beijing, China
4. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Biotechnology, Beijing, China
5. College of Public Health, Zhengzhou University, Zhengzhou, Henan province, China