1. University of Maryland School of Medicine, Baltimore, Maryland, USA.
2. Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland, USA.
3. Department of Quality and Safety, University of Maryland Medical Center, Baltimore, USA.
4. Department of Organizational Systems and Adult Health, University of Maryland School of Nursing, Baltimore, Maryland, USA.
5. Departments of Emergency Medicine and Epidemiology, , University of Maryland School of Medicine, Baltimore, Maryland, USA.
6. Department of Emergency Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA.