1. Institute of Health Informatics, University College London , 222 Euston Road, London NW1 2DA, UK
2. Clinical Research Informatics Unit, University College London Hospitals NHS Healthcare Trust , London, UK
3. Barts Heart Centre, St Bartholomew’s Hospital , London, UK
4. UCL Interaction Centre, University College London , London, UK
5. Section of Cardiovascular Medicine, School of Medicine, Yale University , New Haven, CT, USA
6. Department of Cardiology, University Medical Center Utrecht , Heidelberglaan 100, Utrecht 3584 CX, The Netherlands