1. Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, USA
2. Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
3. Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
4. Department of Pathology and Laboratory Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
5. Department of Radiology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA