1. From Clinica Medica “L. Condorelli,” Department of Internal Medicine, University of Catania (L.S.M., A.C., B.S., I.B., P.B., L.B., P.C.), Italy; the Cardiology Unit of Morelli Hospital (F.A.B.), Reggio Calabria, Italy; and CNR, Centre of Clinical Physiology and Division of Nephrology (G.T., F.M., C.Z.), Reggio Calabria, Italy.