1 Myocardial Function Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; Cardiology Department, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Imperial Centre for Cardiac Engineering, Imperial College London, London, United Kingdom.
2 Cardiology Department, Derriford Hospital, University Hospitals Plymouth NHS Trust, Plymouth, United Kingdom.
3 Cardiology Department, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom.
4 Myocardial Function Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; Cardiology Department, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom.
5 Cardiology Department, St Bartholomew's Hospital, Barts Health NHS Trust, London, United Kingdom.
6 Cardiology Department, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Imperial Centre for Cardiac Engineering, Imperial College London, London, United Kingdom; Department of Bioengineering, Imperial College London, London, United Kingdom.
7 Myocardial Function Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; Cardiology Department, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Imperial Centre for Cardiac Engineering, Imperial College London, London, United Kingdom. Electronic address: [email protected].