1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Department of Health and Human Services, Rockville, MD
2. Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA
3. Pulmonary and Vascular Medicine Branch, National Heart Lung and Blood Institute, NIH, Department of Health and Human Services, Bethesda, MD
4. Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland