1. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
2. Department of Veterans Affairs, Tennessee Valley Healthcare Systems, Nashville, Tennessee 37212, United States
3. Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37240, United States
4. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
5. Department of Chemistry, Stanford University, Stanford, California 94305, United States
6. Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee 37232, United States
7. Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana 70803, United States
8. Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan 48824, United States