1. Department of Internal Medicine, University of Messina, Messina, Italy
2. Department of Clinical and Experimental Medicine, Policlinico G.B. Rossi, University of Verona, Verona, Italy
3. Jean Mayer-U.S. Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, MA
4. Boston University School of Medicine and The Framingham Heart Study, National Heart, Lung, and Blood Institute, Framingham, MA