1. Department of Emergency Medicine, University of Michigan, Ann Arbor, Michigan, USA;
2. University of Michigan Injury Prevention Center, Ann Arbor, Michigan, USA;
3. University of Michigan Addiction Center, Ann Arbor, Michigan, USA;
4. Department of Psychiatry, University of Michigan, Ann Arbor, Michigan, USA;
5. Hurley Medical Center, Flint, Michigan, USA;
6. The University of Queensland, St. Lucia, Queensland, Australia;
7. University of Michigan Youth Violence Prevention Center, Ann Arbor, Michigan, USA;
8. Department of Health Behavior and Health Education, University of Michigan, Ann Arbor, Michigan, USA