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.