1. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois2Department of Preventive Medicine, The University of Mississippi Medical Center, Jackson
2. Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, Maryland
3. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
4. Department of Epidemiology, Colorado School of Public Health, Aurora
5. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis
6. Division of Research, Kaiser Permanente of Northern California, Oakland