1. Center for Microbial Pathogenesis, Duke University School of Medicine, Durham, NC 27710, USA
2. Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, USA
3. Department of Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA
4. Deceased
5. Department of Medicine, University of Miami Miller School of Medicine, Miami, FL 33146, USA
6. Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA