1. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Department of Microbiology and Immunology, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
3. Department of Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
4. Department of Biostatistics, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA
5. Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois, USA
6. Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, USA