1. Department of Trauma and Orthopaedic Surgery , Ysbyty Gwynedd, Penrhosgarnedd, Bangor, Gwynedd LL57 2PW, UK
2. Department of Trauma and Orthopaedic Surgery , Wales Deanery, Ty Dysgu, Cefn Coed, Nantgarw CF15 7QQ, UK
3. Department of Orthopaedic Surgery , Queen Elizabeth University Hospital, 1345 Govan Road, Glasgow G51 4TF, UK
4. Department of Medicine , Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi, Salerno, Italy
5. School of Pharmacy and Bioengineering , Keele University School of Medicine, Thornburrow Drive, Stoke on Trent ST4 7QB, UK
6. Centre for Sports and Exercise Medicine , Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, Mile End Hospital, 275 Bancroft Road, London E1 4DG, UK