1. State Key Laboratory for Infectious Diseases Prevention and ControlNational Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
2. Qilu HospitalShandong University, Jinan, China
3. Shandong Academy of Occupational Health and Occupational Medicine Jinan, China
4. Guangdong Provincial Institute of Public HealthGuangdong Provincial Center for Disease Control and Prevention, Guangzhou, China