1. Department of Virology and Immunology, Texas Biomedical Research Institute, San Antonio, Texas, USA
2. National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland, USA
3. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas, USA
4. Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana, USA
5. Department of Microbiology, University of Iowa, Iowa City, Iowa, USA