1. Epidemiology and Applied Research Branch, Division of Cancer Prevention and Control, Centers for Disease Control and Prevention, Atlanta, Georgia.
2. National Center for Chronic Disease Prevention and Disease Promotion, Division of Heart Disease and Stroke Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia.
3. Northrop Grumman Corporation, Information Systems, Atlanta, Georgia.
4. Social and Scientific Systems, Inc., Durham, North Carolina.
5. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.
6. Epidemiology Branch, National Institute of Environmental Health Sciences, Durham, North Carolina.