1 Clinical Electrophysiology and Pacing Laboratory, Clinical Emergency Hospital of Bucharest, Bucharest, Romania.
2 'Carol Davila' University of Medicine and Pharmacy, Bucharest, Romania.
3 Department of Internal Medicine, Cardiology/Cardiac Electrophysiology, American University of Beirut-Faculty of Medicine and Medical Center, Beirut, Lebanon.
4 Department of Cardiology, Medical University of Lodz, Lodz, Poland.
5 1st Chair and Department of Cardiology, Warsaw Medical University, Warsaw, Poland.
6 Department of Electrophysiology, Heart Center Leipzig, Leipzig, Germany.
7 Electrophysiology Unit, Division of Cardiology, Fondazione Cardiocentro Ticino, Lugano, Switzerland.
8 Department of Cardiology, Maastricht University Medical Center, Maastricht, Netherlands.
9 Semmelweis University, Budapest, Hungary.
10 Heart Research Follow-up Program, University of Rochester Medical Center, 265 Crittenden Blvd., Box 653, Rochester, NY, USA.