1. Key Laboratory for Emergency Pathogen Detection, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, China.
2. Department of Epidemiology, School of Public Health, Sun Yat-Sen University, Guangzhou, China.
3. The Second Clinical College, School of Public Health and Tropic Medicine, Southern Medical University, Guangzhou, China.
4. Department of Epidemiology, School of Public Health and Tropic Medicine, Southern Medical University, Guangzhou, China.
5. Department of Bio-statistics, School of Public Health and Tropic Medicine, Southern Medical University, Guangzhou, China.
6. Medical Laboratory, Guangdong Provincial the Second Hospital, Guangzhou, China.