1. Department of Cardiology University Medical Center Utrecht The Netherlands
2. Department of Electrophysiology Alfried Krupp Krankenhaus Essen Germany
3. Department of Medicine Witten/Herdecke University Witten Germany
4. Department of Cardiology Haga Teaching Hospital The Hague The Netherlands
5. Department of Pathology University Medical Center Utrecht The Netherlands
6. Abbott Medical Nederland Veenendaal The Netherlands
7. Netherlands Heart Institute Utrecht The Netherlands
8. Central Military Hospital Utrecht The Netherlands