1. Cardiology Center University of Szeged Szeged Hungary
2. Heart and Vascular Center Semmelweis University Budapest Hungary
3. Department of Adult Cardiology Gottsegen National Cardiovascular Center Budapest Hungary
4. Central Hospital of Northern Pest ‐ Military Hospital Budapest Hungary
5. Borsod‐Abaúj‐Zemplén County Central Hospital and University Teaching Hospital Miskolc Hungary
6. Jósa András Hospital Nyíregyháza Hungary
7. Biotronik Hungary Ltd. Budapest Hungary
8. AnexenA UG Berlin Germany