1. Guangxi Center for Disease Control and Prevention, Qingxiu District, Nanning, Guangxi, People’s Republic of China
2. State Key Laboratory of Infectious Disease Prevention and Control (SKLID), Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Chinese Center for Disease Control and Prevention (Chinese CDC), Changping District, Beijing, People’s Republic of China
3. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada