1. Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, USA
2. Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts, USA
3. Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Laboratory of Molecular Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
5. Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts, USA
6. Harvard Medical School, Boston, Massachusetts, USA
7. Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
8. Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California, USA
9. VA Palo Alto Health Care System, Palo Alto, California, USA