1. School of Public Health, Southern Medical University, and Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, China (M.K.)
2. Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, China (Y.Y., Y.L., L.S., A.D., T.H., J.Z., J.L., M.C., S.X., M.L., J.J., J.H.)
3. School of Public Health (Shenzhen), Sun Yat-sen University, Shenzhen, China (Y.J.)
4. School of Public Health, Southern Medical University, Guangzhou, China (S.T.).