1. Emory University School of Medicine, Atlanta, GA, USA
2. United States Army, Army Medical Department (AMEDD) Center and School, Fort Sam Houston, TX, USA
3. United States Air Force, Institute of Technology, Wright-Patterson AFB, OH, USA
4. Department of Neurology, University of Colorado School of Medicine, Aurora, CO, USA
5. Department of Medicine (Infectious Diseases), University of Colorado School of Medicine, Aurora, CO, USA
6. Department of Epidemiology, Colorado School of Public Health, Aurora, CO, USA