Simonetta Genovesi1, Antonio Vincenti2, Stefano Severi3. 1. Nephrology Unit, San Gerardo Hospital, Monza, Italy Department of Health Sciences, University of Milano Bicocca, Monza, Italy. 2. Electrophysiology and Cardiac Pacing Unit, San Gerardo Hospital, Monza, Italy. 3. Department of Electrical, Electronic and Information Engineering 'Guglielmo Marconi', University of Bologna, Cesena, Italy.