1. Cardiac Arrhythmia Service, Massachusetts General HospitalHarvard Medical School Boston Massachusetts
2. Emergency Clinical County HospitalUniversity of Medicine and Pharmacy “Iuliu Hatieganu,” Cluj‐Napoca Romania
3. Bridgeport HospitalYale University School of Medicine Bridgeport Connecticut
4. Municipal HospitalUniversity of Medicine and Pharmacy “Iuliu Hatieganu,” Cluj‐Napoca Romania