1. Framingham Heart Study, Framingham, MA, USA.
2. Department of Mathematics, Boston University, Boston, MA, USA.
3. Jean Mayer US Department of Agriculture Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA.
4. Cardiology Division, Massachusetts General Hospital, Boston, MA, USA.
5. The Center for Population Studies of the National Heart, Lung, and Blood Institute, Bethesda, MD, USA.
6. Preventive Medicine and Cardiology Sections, Boston University School of Medicine, Boston, MA, USA.