1. First Department of Cardiology, Medical University of Warsaw, Poland (M.G.).
2. Department of Cardiology, Maastricht University Medical Centre and Cardiovascular Research Institute Maastricht, Maastricht University, the Netherlands (M.G., D.L.).
3. Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark (D.L.).
4. Centre for Heart Rhythm Disorders, Royal Adelaide Hospital, University of Adelaide, Australia (D.L.).
5. Department of Cardiology, Radboud University Medical Centre, Nijmegen, the Netherlands (D.L.).