[1] Univ Maryland, Sch Med, Div Nephrol, Dept Med, Baltimore, MD 21201 USA
[2] Fred Hutchinson Canc Res Ctr, Program Clin Stat, Seattle, WA 98104 USA
[3] Fred Hutchinson Canc Res Ctr, Program Biostat, Seattle, WA 98104 USA
[4] Fred Hutchinson Canc Res Ctr, Long Term Follow Up Program, Seattle, WA 98104 USA
[5] Univ Washington, Dept Med, Seattle, WA USA
[6] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA