1. Center for Child Health, Behavior and Development, Seattle Children’s Research Institute , Seattle, WA , USA
2. Department of Pediatrics, University of Washington , Seattle, WA , USA
3. University of Arizona Extension, 4-H State Office, University of Arizona , Tucson AZ , USA
4. University of Washington, School of Public Health , Seattle WA , USA
5. The Firearm Injury & Policy Research Program, University of Washington, Department of Pediatrics , Seattle WA , USA