1 Section of Vascular Surgery, Department of Surgery and Cancer, Imperial College London, London, United Kingdom, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Science, University of Oxford, Oxford, United Kingdom.
2 Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Science, University of Oxford, Oxford, United Kingdom.
3 Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Science, University of Oxford, Oxford, United Kingdom, Department of Plastic Surgery, Stoke Mandeville Hospital, Aylesbury, United Kingdom.