1. Department of Pediatrics, Division of Infectious Diseases, Rush Medical College, Rush University Medical Center, Chicago, Illinois
2. Section of Pediatric Infectious Diseases, Rush Medical College, Rush University Medical Center, Chicago, Illinois
3. Cook County Health and Hospitals System, Chicago, Illinois
4. Center for Disease Dynamics, Economics & Policy, Washington, DC
5. Department of Internal Medicine, Division of Infectious Diseases, Rush Medical College, Rush University Medical Center, Chicago, Illinois
6. Princeton University, New Jersey