1. Department of Pharmacology and Toxicology/Brown Cancer Center, University of Louisville, Louisville, Kentucky 40202, Biological and Medical Research, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia, Department of Statistics, University of Kentucky, Lexington, Kentucky 40506, Division of Population Science, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, and Division of Cancer Prevention & Control, National Cancer Institute, Bethesda, Maryland 20892