1. Trauma and Orthopaedics, Huddersfield Royal Infirmary, HD2 2DB, Huddersfield, West Yorkshire UK
2. University Hospitals Coventry and Warwickshire, Coventry UK
3. Calderdale Royal Hospital, HX1 0PW, Salterhebble, Halifax, West Yorkshire UK
4. Huddersfield NHS Trust, Huddersfield UK