1. From the Cancer Prevention Program, Fred Hutchinson Cancer Research Center, Seattle, WA (MLN, ARK, REP, and MDT); the Department of Family and Preventive Medicine, University of California, San Diego, CA (CLR); the School of Public Health and Community Medicine, University of Washington, Seattle, WA (ARK and MDT); the Division of Epidemiology, University of Minnesota, Minneapolis, MN (DN-S); and