1 Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA; Department of Biostatistics, University of Washington, Seattle, WA, USA. Electronic address: retzioni@fredhutch.org.
2 Divisions of Human Biology and Clinical Research, Fred Hutchinson Cancer Research Center, Seattle, WA, USA; Department of Pathology, University of Washington, Seattle, WA, USA.
3 Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.