1. Cardiology-Electrophysiology, University Hospital Gasthuisberg, Leuven, Belgium
2. Departments of Cardiology and Pathology, University of Padova, Padova
3. National Institute of Sports Medicine, Italian National Olympic Committee, Rome, Italy
4. Departments of Cardiology and Pneumology, Hospital München-Bogenhausen, Munich, Germany
5. Heart Center, Radboud University Medical Center and Department of Sports Cardiology & Cardiac Rehabilitation, St. Maartenskliniek, Nijmegen
6. Department of Cardiology, Maxima Medical Centre, Veldhoven, The Netherlands
7. Department of Cardiology, Civil Hospital, Conegliano, Italy
8. Department of Heart Disease, Haukeland University Hospital, Bergen, Norway