1. Department of Epidemiology and Health Statistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China.
2. Center for Disease Control and Prevention of Chinese People's Liberation Army, Beijing, China.
3. National Clinical Research Center for Infectious Diseases, Shenzhen Third People's Hospital, Southern University of Science and Technology, Shenzhen, China.
4. School of Public Health, Shenzhen University Health Science Center, Shenzhen, China.