1. Department of Cardiovascular Surgery, University Heart Center Freiburg-Bad Krozingen, Freiburg, Germany
2. Department of Cardiovascular Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
3. Division of Vascular Surgery, “Vita salute” University, Ospedale San Raffaele, Milan, Italy
4. Division of Imaging Sciences and Biomedical Engineering, St Thomas’ Hospital, King’s College London, London, UK
5. Heart Center Hiertzing, Vienna, Austria
6. University Clinic for Cardiovascular Surgery, University Hospital Zurich, Zurich, Switzerland
7. West German Heart Center, Essen, Germany