1. Department of Immunization Program, Shanghai Municipal Centers for Disease Control & Prevention, Shanghai, China
2. Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI, USA
3. Department of Health Behavior & Health Education, School of Public Health, University of Michigan, Ann Arbor, MI, USA
4. Department of Internal Medicine, Division of General Medicine, Michigan Medicine, Ann Arbor, MI, USA
5. Department of Internal Medicine, Division of Infectious Disease, Michigan Medicine, Ann Arbor, MI, USA
6. Susan B. Meister Child Health Evaluation and Research Center, Department of Pediatrics and Communicable Diseases, Michigan Medicine, Ann Arbor, MI, USA