1. Department of Emergency Medicine, Heersink School of Medicine, University of Alabama at Birmingham , Birmingham, Alabama, 35233 , USA
2. Department of Medicine, Division of Infectious Diseases, Heerskin School of Medicine, University of Alabama at Birmingham , Birmingham, Alabama, 35233 , USA
3. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham , Birmingham, Alabama, 35233 , USA
4. UAB Employee Health, University of Alabama at Birmingham , Birmingham, Alabama, 35233 , USA
5. Department of Health Policy and Organization, School of Public Health, University of Alabama at Birmingham , Birmingham, Alabama, 35233 , USA