1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892;
2. Vanderbilt University, Nashville, Tennessee 37232;
3. Memorial Sloan-Kettering Cancer Center, New York, New York 10021;
4. Department of Bioengineering, University of Washington, Seattle, Washington 98195; and
5. Sylvester Comprehensive Cancer Center, University of Miami, Miami, Florida 33136