1. Department of Epidemiology, Public Health College of Harbin Medical University, Harbin, China.
2. Department of Infectious Diseases, Fourth Affiliated Hospital of Harbin Medical University, Harbin, China.
3. Harbin Municipal Center for Disease Control and Prevention, Harbin, China.
4. Center for Genome Research of Harbin Medical University, Harbin, China.
5. Department of Clinical Laboratory, Second Affiliated Hospital of Harbin Medical University, Harbin, China.