1. Department of Radiology, Tallaght Hospital, Tallaght, Dublin 24, Ireland
2. UCLA Cardiac Arrhythmia Center & Neurocardiology Research Center of Excellence, David Geffen School of Medicine, 10833 Le Conte Ave, Los Angeles, CA 90095, USA
3. Department of Radiology, Papworth Hospital NHS Foundation Trust, Cambridge, CB23 3RE, UK
4. Department of Cardiology, Tallaght Hospital, Tallaght, Dublin 24, Ireland
5. Cardiac Arrhythmia Department, Queens University, 99 University Ave, Kingston, ON K7L 3N6, Canada