1. From the Department of Internal Medicine, Divisions of Cardiovascular Diseases (M.R.-P., J.H., A.L.) and Hypertension (L.O.L.), Mayo Clinic, Rochester, Minn; the National Cardiovascular Center Research Institute Fujishirodai (T.S.), Suita, Osaka, Japan; and the Department of Medicine (C.N.), University of Naples, Naples, Italy.