1. Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool L7 8TX, UK
2. Faculty of Health and Wellbeing, University of Central Lancashire, Preston, UK
3. II Department of Heart Arrhythmia, National Institute of Cardiology, Warsaw, Poland
4. First Department of Cardiology and Angiology, Silesian Centre for Heart Disease, Zabrze, Poland
5. 1st University Department of Cardiology, National & Kapodistrian University of Athens School of Medicine, Athens, Greece
6. Electronic, Information and Biomedical Engineering Department, Politecnico di Milano, Milan, Italy
7. School of Medicine, University of Belgrade, Belgrade, Serbia
8. Cardiology Clinic, Clinical Centre of Serbia, Belgrade, Serbia