1. GKT School of Medical Education, King’s College London , Guy's Campus, Great Maze Pond, London SE1 1UL , UK
2. Faculty of Medicine, Imperial College London , Exhibition Road, London LSW7 2AZ , UK
3. Cardiology Department, Tahir Heart Institute , 35460 Rabwah , Pakistan
4. Oxford Heart Centre, John Radcliffe Hospital , Headley Way, Oxford OX3 9DU , UK