1. 1st Department of Cardiology, Medical University of Warsaw, 02-097 Warsaw, Poland
2. II Department of Heart Arrhythmia, National Insitute of Cardiology, 04-628 Warsaw, Poland
3. 1st Department of Cardiology, Medical University of Lodz, 91-347 Lodz, Poland
4. Department of Cardiology, Voivodship Specialist Hospital, 06-400 Ciechanow, Poland
5. CCB, Cardiology, Med. Klinik III, Markuskrankenhaus, 60431 Frankfurt, Germany
6. Department of Cardiology, Hospital de la Santa Creu i Sant Pau, Universitat Autònoma de Barcelona, IIB SANT PAU, CIBERCV, 08025 Barcelona, Spain
7. Cardiology Department, Fondazione Cardiocentro Ticino, 6900 Lugano, Switzerland
8. Università della Svizzera Italiana Lugano, 6900 Lugano, Switzerland
9. Cardiology Department, Hospital da Luz Arrabida, 4400-346 Vila Nova de Gaia, Portugal
10. Heart Rhythm Department, Clinique Pasteur, 31076 Toulouse, France
11. Heart Rhythm Management Centre, Universitair Ziekenhuis Brussel-Vrije Universiteit Brussel, 1090 Brussels, Belgium
12. Paris Cardiovascular Research Center, INSERM Unit 970, 75015 Paris, France
13. Department of Cardiology and Electrotherapy, Medical University of Gdansk, 80-214 Gdansk, Poland