1. Department of Cardiology, Antwerp University Hospital, Antwerpen, Belgium
2. Department of Cardiology, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium
3. Department of Cardiology, CHU Sart Tilman, Liège. UZB, Brussels, Belgium
4. Department of Cardiology, Ghent University hospital, Ghent, Belgium