1. Medical Practice Evaluation Center, Massachusetts General Hospital , Boston, Massachusetts , USA
2. Division of Viral Diseases, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
3. Division of Infectious Diseases, Massachusetts General Hospital , Boston, Massachusetts , USA
4. Division of General Academic Pediatrics, Massachusetts General Hospital , Boston, Massachusetts , USA
5. Department of Medicine, Harvard Medical School , Boston, Massachusetts , USA
6. Immunization Services Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
7. Division of Global Migration and Quarantine, Centers for Disease Control and Prevention , Atlanta, Georgia , USA
8. MGH Biostatistics Center, Massachusetts General Hospital , Boston, Massachusetts , USA
9. Department of Global Health, Boston University School of Public Health , Boston, Massachusetts , USA
10. Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health , Boston, Massachusetts , USA
11. Travelers' Advice and Immunization Center, Massachusetts General Hospital , Boston, Massachusetts , USA