[1] Vet Affairs Paget Sound Hlth Care Syst, Med Res Serv, Seattle, WA 98108 USA
[2] Fred Hutchinson Canc Res Ctr, Div Mol Med, Seattle, WA 98109 USA
[3] Univ Washington, Sch Med, Dept Med, Div Hematol, Seattle, WA 98195 USA
[4] Univ Washington, Sch Med, Dept Med, Div Oncol, Seattle, WA 98195 USA