1. Department of Vascular Surgery, Central Clinic of Athens, Athens, Greece
2. Department of Cardiac and Vascular Diseases, Medical College, Jagiellonian University, Krakow, Poland
3. John Paul II Hospital, Krakow, Poland
4. Department of Surgical Biotechnology, Division of Surgery and Interventional Science, University College London Medical School, London, UK
5. Royal Free Hospital Campus, University College London (UCL) and Department of Clinical Biochemistry, London, UK
6. Liverpool Centre for Cardiovascular Science at University of Liverpool, Liverpool John Moores University and Liverpool Heart & Chest Hospital, Liverpool, UK
7. Danish Center for Health Services Research, Department of Clinical Medicine, Aalborg University, Aalborg, Denmark