1. Department of Medicine, Division of Infectious Diseases, University of Colorado Aschutz Medical Campus , Aurora, Colorado, USA
2. Department of Clinical and Administrative Pharmacy, University of Georgia College of Pharmacy , Albany, Georgia, USA
3. Department of Medicine, Division of Infectious Diseases, University of California, Davis Medical Center , Sacramento, California, USA
4. Department of Medical Microbiology and Immunology, University of California, Davis Medical Center , Sacramento, California, USA