1. Department of Epidemiology and Health Statistics, School of Public Health Anhui Medical University Hefei Anhui China
2. Department of Expanded Program on Immunization Lu'an Municipal Center for Disease Control and Prevention Lu'an Anhui China
3. Blood Purification Center The First Affiliated Hospital of Anhui Medical University Hefei Anhui China
4. Department of Health Inspection and Quarantine, School of Public Health Anhui Medical University Hefei Anhui China
5. Microbiology Laboratory Lu'an Municipal Center for Disease Control and Prevention Lu'an Anhui China