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A. R. Kristal and T. D. Koepsell are with the Fred Hutchinson Cancer Research Center and the departments of Epidemiology and Health Services of the University of Washington in Seattle, USA
C. H. A. Andrilla and P. H. Diehr are with the Department of Biostatistics and A. Cheadle is with the Department of Health Services at the University of Washington, USA
A. R. Kristal and T. D. Koepsell are with the Fred Hutchinson Cancer Research Center and the departments of Epidemiology and Health Services of the University of Washington in Seattle, USA
C. H. A. Andrilla and P. H. Diehr are with the Department of Biostatistics and A. Cheadle is with the Department of Health Services at the University of Washington, USA
C. H. A. Andrilla and P. H. Diehr are with the Department of Biostatistics and A. Cheadle is with the Department of Health Services at the University of Washington, USA