1. Department of Medicine, Sahlgrens University Hospital/Östra,Göteborg, Sweden
2. Department of Medicine, University of Brescia, Italy
3. Unité Biologie et Médecine du Sport, Hdôpital Pontchaillou, Rennes, France
4. Wellness Medical Center, Stockport, UK
5. Heart Centre Radboud University Hospital Nijmegen and Cardiac Rehabilitation and Department of Sportscardiology St Maartenskliniek, Nijmegen, The Netherlands
6. Department of Cardiology, University Hospital, Bern, Switzerland
7. Department of Cardiology, Meander Medisch Centrum, Amersfoort, The Netherlands
8. Department of Medicine, Diakonhjemmet Hospital, Oslo, Norway.