1. From the Division of Cardiovascular Diseases (J.H., A.L.), Division of Nephrology and Hypertension (L.O.L.), and Division of Biochemistry and Molecular Biology (D.M.), Mayo Clinic, Rochester, Minn; Department of General Pathology (C.N.), Division of Clinical Pathology and Excellence Research Center on Cardiovascular Diseases, 1st School of Medicine, II University of Naples, Naples, Italy.