1. International Centre for Circulatory Health, National Heart and Lung Institute, Imperial College London, Hammersmith Hospital, London, United Kingdom (A.N.N., M.G., J.P.H., D.P.F., R.A.-L.).
2. Interventional Cardiology Division, Cardio-Thoracic-Vascular Department, San Raffaele Scientific Institute, Milan, Italy (M.G.).