1. From the Nutritional Epidemiology Branch (CEM, SMG, SCM, YP, and AS) and the Occupational Epidemiology Branch (AB), Division of Cancer Epidemiology and Genetics, and the Risk Factor Monitoring and Methods Branch, Division of Cancer Control and Population Sciences (HRB and RPT), National Cancer Institute, Rockville, MD; and the AARP, Washington, DC (AH).