Paolo Verdecchia1, Fabio Angeli2, Claudia Bartolini3, Gianpaolo Reboldi4. 1. Department of Internal Medicine, Hospital of Assisi, Assisi, Italy. Electronic address: verdec@tin.it. 2. Division of Cardiology and Cardiovascular Pathophysiology, Hospital of Perugia, Perugia, Italy. 3. Department of Internal Medicine, Hospital of Assisi, Assisi, Italy. 4. Department of Internal Medicine, University of Perugia, Italy.