1. Department of Medical and Surgical Sciences University of Foggia Foggia Italy
2. Section of Cardiology, Department of Clinical and Experimental Medicine, University of Messina Policlinico G. Martino Messina Italy
3. Department of Cardiology University of Mannheim Mannheim Germany
4. Department of Cardiology and Angiology, Bergmannsheil University Hospitals Ruhr University of Bochum Bochum Germany