1. Division of Internal Medicine, Ospedale della Valdichiana "S Margherita", Cortona, Italy
2. Department of Medicine and Surgery, Section of Internal and Cardiovascular Medicine, University of Perugia, Perugia, Italy
3. Emergency Medicine Department, San Giovanni Battista Hospital, Foligno, Italy
4. Department of Medicine, Unit of General Medicine for the Study and Treatment of Hypertensive Disease, University of Verona, Policlinico GB Rossi, Verona, Italy