1. Department of Cardiology, University Heart Center Leipzig , Strümpellstr. 39 , 04289 Leipzig, Germany
2. Department of Cardiology, Imed Hospitales, Av. de la Ilustración, 1, 46100 Burjassot , Valencia , Spain
3. Laboratory of Epidemiological and Clinical Cardiology, Department of Medical and Surgical Sciences (DIMEC), Università di Bologna , Bologna , Italy