1. Department of Emergency Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
2. Basildon and Thurrock University Hospitals, Anglia Ruskin School of Medicine, London-Essex, United Kingdom.
3. Department of Pharmacotherapy, Virginia Commonwealth University, Medical College of Virginia, Richmond, Virginia.
4. Department of Outcomes Sciences and Neurosurgery, Virginia Commonwealth University, Medical College of Virginia, Richmond, Virginia.
5. Department of Surgery, University of Maryland, Baltimore, Maryland.