1. Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
2. Clinical Microbiology Laboratory, Stanford Health Care, Stanford, California, USA
3. Department of Medicine, Division of Infectious Diseases, Central Virginia VA Health Care System, Richmond, Virginia, USA
4. Department of Internal Medicine, Division of Infectious Diseases, Virginia Commonwealth University School of Medicine, Richmond, Virginia, USA
5. Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
6. Quantitative Sciences Unit, Stanford University School of Medicine, Stanford, California, USA
7. Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
8. Department of Quality, Patient Safety and Effectiveness, Stanford University School of Medicine, Stanford, California, USA