1. Department of Cardiology, University Medical Centre Groningen, University of Groningen, PO Box 30.001, 9700 RBGroningen, The Netherlands
2. Department of Epidemiology, Erasmus Medical Centre, Rotterdam, The Netherlands
3. Department of Cardiology, University Hospitals Leuven, Leuven, Belgium
4. Department of Cardiology, Erasmus Medical Centre, Rotterdam, The Netherlands
5. Department of Cardiology, Academic Medical Centre, Amsterdam, The Netherlands
6. Department of Cardiology, University Hospital Utrecht, Utrecht, The Netherlands
7. Department of Cardiology, Leiden University Medical Centre, Leiden, The Netherlands
8. Department of Cardiology, Radboud University Medical Centre Nijmegen, Nijmegen, The Netherlands