1. Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, Virginia, USA
2. Center for Health Policy, University of Virginia, Charlottesville, Virginia, USA
3. University of Nebraska College of Medicine, Omaha, Nebraska, USA
4. School of Medicine Research Computing, University of Virginia, Charlottesville, Virginia, USA
5. Division of Infectious Diseases, University of Nebraska Medical Center, Omaha, Nebraska, USA
6. Virginia Department of Health, Richmond, Virginia, USA
7. Division of Infectious Diseases, University of South Carolina, Columbia, South Carolina, USA
8. Public Health Sciences, University of Virginia, Charlottesville, Virginia, USA
9. Department of Medicine, University of Virginia, Charlottesville, Virginia, USA