1. Division of Infectious Diseases, Department of Medicine, Case Western Reserve University, Cleveland, Ohio
2. Virology Program, Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, Ohio
3. Infectious Diseases and Geographical Medicine, Department of Medicine, Stanford University, Stanford, California
4. Center for Infection, Department of Cellular and Molecular Medicine, St. George's University of London, London, United Kingdom