[1] Univ Washington, Sch Med, Seattle, WA USA
[2] Fred Hutchinson Canc Res Ctr, Dept Clin Biostat, 1124 Columbia St, Seattle, WA 98104 USA
[3] Fred Hutchinson Canc Res Ctr, 1124 Columbia St, Seattle, WA 98104 USA
[4] Bloodworks NW Res Inst, Seattle, WA USA