1. Academic Department of Trauma & Orthopaedics, School of Medicine University of Leeds, Leeds General Infirmary, Great George Street, Leeds LS1 3EX, UK.
2. Center for Clinical Research, Department of Trauma & Orthopaedic Surgery Unfallkrankenhaus Berlin and University of Greifswald, Warenerstrasse 7, 12683, Berlin Germany.
3. Department of Orthopaedic Surgery University of Louisville School of Medicine, ACB, Third Floor Bridge, HSC 234 Louisville, Kentucky 40292, USA.