1. Semmelweis University, Heart and Vascular Center Budapest Hungary
2. Gottsegen National Cardiovascular Center Budapest Hungary
3. Department of Cardiology Hungarian Defence Forces Medical Centre Budapest Hungary
4. Department of Electrocardiology Medical University of Lodz Lodz Poland
5. Department of Electrocardiology and Heart Failure Medical University of Silesia Katowice Poland
6. Department of Cardiology and Angiology National Institute of Cardiovascular Diseases and Slovak Medical University Bratislava Slovakia
7. Cardiac Electrophysiology Division, Department of Internal Medicine University of Szeged Szeged Hungary
8. Pharmahungary Group Szeged Hungary
9. Clinical Cardiovascular Research Center University of Rochester Rochester NY USA