1. Department of Medicine, Division of Infectious Diseases, University of Alabama at Birmingham, Birmingham, Alabama, USA
2. Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
3. Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA
4. Department of Health System Information Services, University of Alabama at Birmingham, Birmingham, Alabama, USA
5. Department of Medicine, Division of Pulmonary and Critical Care, University of Alabama at Birmingham, Birmingham, Alabama, USA
6. Department of Emergency Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA