1 Center for Child Health, Behavior, and Development, Seattle Children's Research Institute, Seattle, Washington; Firearm Injury and Policy Research Program, Harborview Injury Prevention and Research Center, University of Washington, Seattle, Washington. Electronic address: alice.ellyson@seattlechildrens.org.
2 Firearm Injury and Policy Research Program, Harborview Injury Prevention and Research Center, University of Washington, Seattle, Washington; Department of Epidemiology, University of Washington, Seattle, Washington; Department of Geography, University of Washington, Seattle, Washington.
3 Firearm Injury and Policy Research Program, Harborview Injury Prevention and Research Center, University of Washington, Seattle, Washington; Department of Epidemiology, University of Washington, Seattle, Washington; Department of Pediatrics, University of Washington, Seattle, Washington.
4 Center for Child Health, Behavior, and Development, Seattle Children's Research Institute, Seattle, Washington; Firearm Injury and Policy Research Program, Harborview Injury Prevention and Research Center, University of Washington, Seattle, Washington; Department of Epidemiology, University of Washington, Seattle, Washington; Department of Pediatrics, University of Washington, Seattle, Washington.