1. Violence Prevention Research Program, Department of Emergency Medicine, School of Medicine, University of California, Davis, Davis
2. Department of Public Health Sciences, School of Medicine, University of California, Davis, Sacramento
3. Department of Population Health and Reproduction, School of Veterinary Medicine and Department of Public Health Sciences, School of Medicine, University of California, Davis, Davis
4. Department of Population Health, New York University, New York
5. Prevention Research Center, Pacific Institute for Research and Evaluation, Berkeley, California
6. Stanford Law School, Stanford University, Stanford, California
7. Department of Medicine, Stanford University School of Medicine, Stanford University, Stanford, California