1. Department of Emergency Medicine Oregon Health & Science University Portland Oregon USA
2. Department of Emergency Medicine Denver Health Medical Center, University of Colorado School of Medicine Denver Colorado USA
3. Department of Emergency Medicine University of California Davis Sacramento California USA
4. Division of Trauma, Critical Care and Acute Care Surgery, Department of Surgery Oregon Health & Science University Portland Oregon USA
5. Insurance Institute for Highway Safety Arlington Virginia USA
6. Alcohol Research Group Emeryville California USA