1. Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
2. School of Medicine, University of North Carolina at Chapel Hill
3. Department of Microbiology, National Autonomous University of León, Nicaragua
4. Facultad de Ciencias Médicas, de la Salud y de la Vida, Universidad Internacional del Ecuador Quito; Institute of Infection and Immunity, St George’s University of London, United Kingdom
5. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia