1 Institute for Cardiovascular Science, University College London, London, United Kingdom; Department of Cardiology, St Bartholomew's Hospital, London, United Kingdom. Electronic address: johanna.tonko.21@ucl.ac.uk.
2 Department of Cardiology, Royal Sussex County Hospital, Brighton and Sussex University Hospitals NHS Foundation Trust, Brighton, United Kingdom.
3 Institute for Cardiovascular Science, University College London, London, United Kingdom; Department of Cardiology, St Bartholomew's Hospital, London, United Kingdom.