1. Department of Epidemiology, Public Health College of Harbin Medical University, Harbin 150081, China.
2. Department of Infectious Diseases, First Clinical College of Harbin Medical University, Harbin 150001, China.
3. Xinkang Prison of Heilongjiang Province, Harbin, China.
4. Department of Microbiology, Harbin Medical University, Harbin 150081, China.
5. Department of Hematology, First Clinical College of Harbin Medical University, Harbin 150001, China.