1. Division of Infectious Diseases, Emory University School of Medicine, Atlanta, Georgia, USA
2. Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
3. Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
4. Department of Internal Medicine (Infectious Diseases), Rush University Medical Center, Chicago, Illinois, USA
5. Department of Pathology, Rush University Medical Center, Chicago, Illinois, USA