[1] Univ Washington, Sch Publ Hlth & Community Med, Dept Epidemiol, Seattle, WA 98104 USA
[2] Univ Washington, Harborview Med Ctr, Harborview Injury Prevent & Res Ctr, Seattle, WA 98104 USA
[3] Univ Washington, Sch Publ Hlth & Community Med, Dept Biostat, Seattle, WA 98104 USA
[4] Fred Hutchinson Canc Res Ctr, Seattle, WA 98104 USA