1. Institute of Sports Medicine and Science, Rome, Largo Piero Gabrielli, Roma, Italy
2. Cardiovascular Center Zürich, Hirslanden Klinik im Park, Seestrasse 220, Zürich, Switzerland
3. Department of Medical Sciences, Hospital ‘Città della Salute e della Scienza di Torino’, University of Torino, Corso Bramante, 88, Torino, Italy
4. University Heart Center, Rämistrasse 100, Zürich, Switzerland