1. Department of Radiology, University Hospitals of Leicester NHS Trust, LE5 4PW, Leicester, United Kingdom
2. Foot and Ankle Reconstruction Unit, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex, HA7 4LP, United Kingdom
3. Department of Radiology, Royal National Orthopaedic Hospital NHS Trust, Brockley Hill, Stanmore, Middlesex, HA7 4LP, United Kingdom