1. Department of Cardiology, VU University Medical Center, de Boelelaan 1117, HV Amsterdam, The Netherlands
2. National Heart and Lung Institute - Cardiovascular Science, Imperial College London, The Hammersmith Hospital, Du Cane Road, London, UK
3. Department of Cardiology, Radboud University Medical Center, Geert Grooteplein Zuid 10, GA, Nijmegen, The Netherlands