[1] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA
[2] Univ Washington, Harborview Injury Prevent & Res Ctr, Firearm Injury & Policy Res Program, Seattle, WA 98195 USA
[3] Univ Washington, Dept Pediat, Seattle, WA 98195 USA
[4] Seattle Childrens Res Inst, Ctr Child Hlth Behav & Dev, Seattle, WA USA
[5] Univ Washington, Sch Social Work, Social Dev Res Grp, Seattle, WA 98195 USA
[6] Arizona State Univ, Southwest Interdisciplinary Res Ctr, Sch Social Work, Phoenix, AZ USA
[7] Washington State Univ, Dept Human Dev, Pullman, WA USA
[8] Univ Washington, Hans Rosling Ctr Populat Hlth, Sch Publ Hlth, Dept Epidemiol, 3980 15th Ave NE,Box 351619, Seattle, WA 98195 USA