1. From the Department of Emergency Medicine Harvard Medical SchoolMassachusetts General Hospital Boston MA
2. the Department of Emergency Medicine Integrative Emergency Services, TCU and UNTHSC School of Medicine Fort Worth TX
3. the Department of Emergency Medicine The Ohio State University Columbus OH
4. the Divisions of Trauma and Emergency Medicine Department of Surgery Duke University School of Medicine Durham NC
5. and the Department of Emergency Medicine Los Angeles David Geffen School of Medicine University of California Los Angeles CA