1. Cardiology Research Department; St. Bartholomew's Hospital; Barts Health NHS Trust; London UK
2. Heart Rhythm Centre; NIHR Cardiovascular Biomedical Research Unit; Royal Brompton & Harefield NHS Foundation Trust & Imperial College London; Institute of Cardiovascular Medicine & Sciences; UK
3. Cardiology Department; London Independent Hospital; London UK
4. Cardiology Department; London Bridge Hospital; London UK
5. Department of Cardiology; Christiaan Barnard Memorial Hospital; Cape Town South Africa