1. Department of Diseases of the Developing World, GlaxoSmithKline, Parque Tecnológico de Madrid, Calle de Severo Ochoa, 2, 28760 Tres Cantos, Madrid, Spain
2. Laboratory of Single Molecule Biophysics, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20982, United States
3. Infectious Diseases Discovery, Medicines Opportunities Research Unit, GlaxoSmithKline, Collegeville, Pennsylvania 19426, United States
4. VA Tennessee Valley Healthcare System, Nashville, Tennessee 37212, United States