1. Faculty of Medicine, University Hasselt, Belgium.
2. Dept. of Cardiology, H.-Hart Hospital, Roeselare, Belgium.
3. Brussels Heart Centre, St-Jan Hospital, Brussels, Belgium.
4. Dept. of Cardiology, Cliniques du Sud-Luxembourg, Arlon, Belgium.
5. Dept. of Cardiology, Erasmus MC, Rotterdam, The Netherlands.
6. Dept. of Cardiology, University Hospitals Leuven, Leuven, Belgium.
7. Heart Centre Hasselt, Jessa Hospital, Hasselt, Belgium.