1. Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Massachusetts
2. Department of Epidemiology, Boston University School of Public Health, Massachusetts
3. Division of Epidemiology, Vanderbilt University, Nashville, Tennessee
4. Tufts University School of Medicine, Boston, Massachusetts
5. Centre for Emerging Pathogens, Department of Medicine, Rutgers–New Jersey Medical School, Newark
6. Department of Global Health, Boston University School of Public Health, Massachusetts