1. Institute of Applied Health Sciences, University of Aberdeen, Aberdeen AB24 3FX, UK
2. Queen Elizabeth Hospital Gateshead, Gateshead Health NHS Foundation Trust, Gateshead NE9 6SX, UK
3. Aberdeen Royal Infirmary, NHS Grampian, Aberdeen AB25 2ZN, UK
4. Trauma and Orthopaedics, Dr Gray’s Hospital, NHS Grampian, Elgin IV30 1SN, UK