1. Department of Cardiology, University of Groningen University Medical Centre Groningen, P.O. Box 30.001, 9700 RB Groningen, The Netherlands
2. Department of Cardiology, Amphia Hospital, Breda, The Netherlands
3. Julius Clinical, Zeist, The Netherlands
4. Department of Cardiology, Academic Medical Centre - University of Amsterdam, Amsterdam, The Netherlands
5. Department of Cardiology, Martini Hospital, Groningen, The Netherlands
6. Department of Cardiology, Spaarne Hospital, Haarlem, The Netherlands
7. Department of Cardiology, Maastricht University Medical Centre+, The Netherlands
8. Cardiovascular Research Institute Maastricht, The Netherlands