1 Department of Plastic Surgery, Stoke Mandeville Hospital, Aylesbury HP21 8AL, UK. Electronic address: j.n.rodrigues@doctors.org.uk.
2 Department of Plastic Surgery, Stoke Mandeville Hospital, Aylesbury HP21 8AL, UK; Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
3 Department of Plastic Surgery, Stoke Mandeville Hospital, Aylesbury HP21 8AL, UK; Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK.