1. Department of Cardiology, Public Hospital Elisabethinen, Academic Teaching Hospital, Ordensklinikum A-4020 Linz, Fadingerstraße 1, Austria
2. Department of Cardiology, Centre for Heart Rhythm Disorders, South Australian Health and Medical Research Institute, University of Adelaide and Royal Adelaide Hospital, Adelaide, South Australia, Australia
3. Research and Development, Cardiac Rhythm and Heart Failure, Medtronic Plc., Moundsview, MN, USA; Moundsview, MN, USA
4. Arrhythmia Department and Electrophysiology Laboratory, State Research Institute of Circulation Pathology, Rechkunovskaya 15, Novosibirsk, Russia Research Institute of Circulation Pathology, Novosibirsk, Russia
5. Department of Arrhythmias and Cardiac Pacing, The National Institute of Cardiovascular Diseases, Pod Kr´snou hôrkou 1, Bratislava 37, Slovakia
6. Department of Cardiology, Catharina Hospital, Michelangelolaan 2, EJ Eindhoven, The Netherlands