1. Unit of Cardiovascular Interventions, IRCCS San Raffaele Scientific Institute, Milan, Italy
2. University of Pavia and Coronary Care Unit and Laboratory of Clinical and Experimental Cardiology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
3. Department of Cardiology, Imperial College London, London, UK
4. Cardiac Surgery Unit, Cardio-Thoraco-Vascular Department, San Raffaele Scientific Institute, Milan, Italy
5. Division of Cardiology, Department of Medicine, University of Cape Town, Cape Town, South Africa
6. Department of Cardiology, Montefiore Medical Center, New York, USA