1 Interventional Cardiology, MedStar Washington Hospital Centre, Washington, DC, USA. Electronic address: hector.m.garciagarcia@medstar.net.
2 Oxford Heart Centre, Oxford University Hospitals, National Health Service Trust, Oxford, United Kingdom; Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom; National Institute for Health Research Oxford Biomedical Research Centre, Oxford, United Kingdom.