1Department of Surgery and Traumatology, R Adams Cowley Shock Trauma Center, University of Maryland Medical Center U.S.A.
2Charles McC. Mathias Jr., National Study Center for Trauma and Emergency Medical Systems, University of Maryland Medical Center U.S.A.
3The Johns Hopkins Center for Injury Research and Policy, University of Maryland Medical Center U.S.A.
4Department of Epidemiology, University of Maryland Medical Center U.S.A.
5Department of Psychiatry, University of Maryland School of Medicine U.S.A.
6Addiction Research Center National Institute on Drug Abuse Baltimore, MD U.S.A.