1. Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland.
2. IMPAQ International, LLC, Columbia, Maryland.
3. Department of Pharmaceutical Health Services Research, University of Maryland School of Pharmacy, Baltimore, Maryland.
4. Shock, Trauma and Anesthesiology Research (STAR)–Organized Research Center, National Study Center for Trauma and Emergency Medical Services, University of Maryland, Baltimore, Maryland.