[1] Fred Hutchinson Canc Res Ctr, Canc Prevent Res Program, Seattle, WA 98109 USA
[2] Fred Hutchinson Canc Res Ctr, Program Epidemiol, Seattle, WA 98109 USA
[3] Univ Washington, Sch Publ Hlth & Community Med, Dept Epidemiol, Seattle, WA 98195 USA
[4] Univ Washington, Sch Publ Hlth & Community Med, Dept Hlth Serv, Seattle, WA 98195 USA
[5] Kaiser Permanente, Div Res, Oakland, CA 94611 USA
[6] Bastyr Univ, Bothell, WA 98011 USA