1 Electrophysiology Department, Barts Heart Centre, St Bartholomew's Hospital, London, United Kingdom; William Harvey Research Institute, Queen Mary University of London, London, United Kingdom.
2 Electrophysiology Department, Barts Heart Centre, St Bartholomew's Hospital, London, United Kingdom.
3 William Harvey Research Institute, Queen Mary University of London, London, United Kingdom.
4 Department of Biomedical Engineering, King's College London, London, United Kingdom.
5 Electrophysiology Department, Barts Heart Centre, St Bartholomew's Hospital, London, United Kingdom; William Harvey Research Institute, Queen Mary University of London, London, United Kingdom. Electronic address: r.schilling@qmul.ac.uk.