1. Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Center for Behavioral & Preventive Medicine, The Miriam Hospital and Brown University, Providence, Rhode Island, USA
3. Department of Psychology, University of Nebraska, Lincoln, Nebraska, USA
4. Center for Epidemiologic Research, Brown University School of Public Health, Providence, Rhode Island, USA
5. School of Public Health, Center for Research on Interpersonal Violence, Georgia State University, Atlanta, Georgia
6. Department of Psychiatry and Human Behavior, Alpert Medical School of Brown University, Providence, Rhode Island, USA