1 King's College Hospital NHS Foundation Trust, London, United Kingdom.
2 School of Cardiovascular and Metabolic Medicine & Sciences, British Heart Foundation Centre of Excellence, King's College London, London, United Kingdom.
3 Essex Cardiothoracic Centre, Mid and South Essex NHS Foundation Trust, Basildon, Essex, United Kingdom.
4 Medical Technology Research Centre, Anglia Ruskin School of Medicine, Chelmsford, Essex, United Kingdom.
5 Surrey and Sussex Healthcare NHS Trust, Surrey, United Kingdom.