1. Department of Cardiology; Academic Medical Centre; Meibergdreef 9 1105 AZ Amsterdam The Netherlands
2. Interuniversity Cardiology Institute of the Netherlands; Utrecht The Netherlands
3. Department of Cardiology; University Nijmegen Medical Centre; Nijmegen The Netherlands
4. Department of Cardiology; University Medical Centre Groningen; Groningen The Netherlands
5. Department of Cardiology; Leiden University Medical Centre; Leiden The Netherlands
6. Department of Cardiology; University Medical Centre Utrecht; Utrecht The Netherlands