1. Department of Cardiology, Leiden University Medical Centre , Albinusdreef 2, 2330RC Leiden , The Netherlands
2. Department of Cardiology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel) , Laarbeeklaan 101, 1090 Brussels , Belgium
3. Department of Cardiology, San Giovanni Battista Hospital , Via Massimo Arcamone, 06034 Foligno PG , Italy
4. Hartcentrum, Ziekenhuis Netwerk Antwerpen (ZNA) Middelheim , Lindendreef 1, 2020 Antwerp , Belgium
5. Heart Institute, Hospital University Germans Trias i Pujol , Carretera de Canyet, s/n, 08916 Badalona , Spain
6. Heart Centre, University of Turku and Turku University Hospital , Kiinamyllynkatu 4-8, 20521 Turku , Finland