1. The Wistar Institute, Philadelphia, PA 19104, USA.
2. Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
3. Department of Infectious Diseases, Hospital Universitari Vall d’Hebrón, Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Barcelona 08035, Spain.
4. University of Utah School of Medicine, Salt Lake City, UT 84132, USA.
5. Department of Pathology, Hospital Universitari Vall d´Hebrón, Barcelona 08035, Spain.
6. Merck & Co. Inc., Kenilworth, NJ 07033, USA.
7. Instituto Nacional de Enfermedades Respiratorias, Tlalpan 14080, Mexico City, Mexico.
8. Jonathan Lax Center, Philadelphia FIGHT, Philadelphia, PA 19107, USA.
9. Emory University, Atlanta, GA 30322, USA.
10. University of Nebraska–Lincoln, Lincoln, NE 68588, USA.
11. Veterans Affairs San Diego Healthcare System and University of California, San Diego, San Diego, CA 92093, USA.
12. IrsiCaixa AIDS Research Institute, Badalona 08916, Barcelona, Spain.
13. University of Vic–Central University of Catalonia (UVic-UCC), Vic 08500, Barcelona, Spain.
14. Catalan Institution for Research and Advanced Studies (ICREA), Barcelona 08908, Catalonia, Spain.