1. Department of Internal Medicine II, Division of Cardiology Medical University of Vienna Vienna Austria
2. Department of Cardiac Surgery University Hospital Basel Basel Switzerland
3. Department of Internal Medicine, Division of Cardiology Medical University of Graz Graz Austria
4. Department of Internal Medicine III Medical University of Innsbruck Innsbruck Austria
5. Department of Internal Medicine I Ordensklinikum Linz Elisabethinen Hospital Linz Austria
6. Department of Internal Medicine III Wiener Neustadt State Hospital Wiener Neustadt Austria
7. Department of Internal Medicine III University Hospital St. Pölten Austria
8. Department of Internal Medicine I Kepler University Hospital Linz Linz Austria
9. Department of Internal Medicine III Wilhelminen Hospital Vienna Vienna Austria
10. Department of Arrhythmias and Cardiac Pacing National Institute of Cardiovascular Diseases and Slovak Medical University Bratislava Slovakia
11. Department of Surgery, Division of Cardiac Surgery Medical University of Vienna Vienna Austria