1. Department of Cardiology, Maastricht University Medical Centre and Cardiovascular Research Institute Maastricht , Universiteitssingel 50, 6229 ER, Maastricht , The Netherlands
2. 1st Department of Cardiology, Medical University of Warsaw , Warsaw , Poland
3. Institute of Pharmacology, West German Heart and Vascular Centre, University Duisburg-Essen , Essen , Germany
4. Centre for Heart Rhythm Disorders, University of Adelaide , Adelaide , Australia
5. Department of Cardiology, Royal Adelaide Hospital , Adelaide , Australia