1. Department of Cardiology, Bern University Hospital, University of Bern, Freiburgstrasse, Bern, Switzerland
2. Thoracic-Vascular Department, Azienda Ospedaliero-Universitaria “Policlinico-Vittorio Emanuele”, Via S. Sofia, 78, Catania, Italy
3. University Hospital of Zurich, Department of Cardiac Surgery, University of Zurich, Rämistrasse 100, Zurich, Switzerland
4. Barts Heart Centre, Barts Health NHS, W Smithfield, London, UK
5. Queen Mary University London, Mile End Rd, Bethnal Green, London, UK
6. Division of Cardiology, Department of Medicine, McGill University Health Centre, 1001 Decarie Blvd, Montreal (Qc), Canada
7. Department of Cardiology, St. Thomas' Hospital, Westminster Bridge Rd, Lambeth, London, UK