1. Department of Pathology (C.K.J., Y.E.N.), University of Pittsburgh, Pittsburgh, Pennsylvania 15261
2. Department of Hospital Pathology (C.K.J.), The Catholic University of Korea, Seoul 137–701, Republic of Korea
3. Radiation Epidemiology and Biostatistics Branches (J.H.L., A.V.B., M.P.L., A.J.S.), Bethesda, Maryland 20892
4. Division of Cancer Epidemiology and Genetics and Cancer Genetics Branch (S.A.W.), National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892