1. Department of Cardiology University Hospital Southampton NHS Foundation Trust Southampton UK
2. Bristol Heart Institute University Hospitals Bristol NHS Foundation Trust Bristol UK
3. Department of Arrhythmia Services, Barts Heart Centre St. Bartholomew's Hospital London UK
4. Aston Medical Research Institute, Aston Medical School Aston University Birmingham UK
5. Department of Cardiology The James Cook University Hospital Middlesbrough UK
6. Department of Cardiology Norfolk and Norwich University Hospital Norwich UK