1. Division of Cardiovascular Medicine, Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605, U.S.A.
2. Department of Human Nutrition, Foods, and Exercise, Virginia Tech, VA 24061, U.S.A.
3. Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030, U.S.A.
4. Molecular Cardiology Research Institute, Tufts Medical Center, Boston, MA 02111, U.S.A.