1. Department of Cardiology, Heart Centre, Academic Medical Centre – University of Amsterdam, Meibergdreef 9, 1105AZ Amsterdam, The Netherlands
2. Department of Cardiology, Isala Klinieken, Zwolle, The Netherlands
3. Diagram B.V., Zwolle, The Netherlands
4. Department of Cardiology, Maastricht University Medical Centre, P. Debyelaan 25, 6299 HX Maastricht, The Netherlands