1. Northern Vascular Centre, Freeman Hospital, Newcastle upon Tyne, UK
2. School of Population and Health Sciences, Newcastle University, Newcastle upon Tyne, UK
3. School of Medicine, University of Patras, Patras, Greece
4. Department of Vascular Surgery, University Hospital of Patras, Patras, Greece
5. NorthShore University HealthSystem, Evanston, IL, USA
6. Pritzker School of Medicine, University of Chicago, Chicago, IL, USA
7. Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK