[1] NCI, Inst Biobehav Canc Prevent, Seattle, WA USA
[2] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA
[3] Fred Hutchinson Canc Res Ctr, Div Prevent Hlth Studies, Seattle, WA 98104 USA
[4] Stanford Univ, Stanford Prevent Res Ctr, Program Prevent Outcomes & Practices, Palo Alto, CA 94304 USA
[5] Palo Alto Med Fdn Res Inst, Palo Alto, CA USA
[6] Stanford Univ, Stanford Prevent Res Ctr, Palo Alto, CA 94304 USA
[7] Stanford Univ, Program Prevent Outcomes & Practices, Palo Alto, CA 94304 USA