1. Vanderbilt Institute for Global Health, Vanderbilt University School of Medicine, Nashville, Tennessee.
2. Division of Epidemiology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee.
3. Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee.
4. Beijing Center for Disease Control and Prevention, Beijing, China.
5. 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 (China CDC), Beijing, China.
6. Department of Biostatistics, Vanderbilt University School of Medicine, Nashville, Tennessee.
7. Department of Health Behavior and Health Education, University of Michigan, Ann Arbor, Michigan.
8. Xicheng District Center for Disease Control and Prevention, Beijing, China.