1. Northern Vascular Centre, Freeman Hospital, Newcastle Upon Tyne, NHS Foundation Trust, UK
2. Divisions of Vascular Surgery, New York University Langone Medical Center and Cleveland Clinic, New York, NY and Cleveland, OH, USA
3. Department of Clinical Biochemistry, Royal Free Hospital Campus, University College London Medical School, University College London (UCL), London, UK
4. Vascular and Endovascular Clinic, Athens Medical Center, Athens, Greece