[1] Univ Washington, Dept Pediat, 1959 NE Pacific St,Box 356320, Seattle, WA 98195 USA
[2] Univ Washington, Evans Sch Publ Policy & Governance, Seattle, WA 98195 USA
[3] Univ Washington, Seattle, WA 98195 USA
[4] Univ Washington, Firearm Injury & Policy Res Program, Seattle, WA 98195 USA
[5] Univ Washington, Harborview Injury Prevent & Res Ctr, Seattle, WA 98195 USA
[6] Seattle Childrens Res Inst, Seattle, WA USA
[7] Seattle Univ, Seattle, WA 98122 USA