1 University of Maryland School of Medicine, Baltimore, Maryland.
2 University of Maryland School of Medicine, Department of Emergency Medicine, The Research Associate Program in Emergency Medicine and Critical Care, Baltimore, Maryland.
3 University of Maryland Medical Center, The Critical Care Resuscitation Unit, Baltimore, Maryland.
4 University of Maryland Medical Center, Department of Stroke Neurology, Baltimore, Maryland.
5 University of Maryland School of Medicine, Department of Emergency Medicine, Baltimore, Maryland.
6 University of Maryland School of Medicine, The R Adams Cowley Shock Trauma Center, Baltimore, Maryland.