1. Academic Department of Trauma and Orthopaedics, University of Leeds, School of Medicine, Clarendon Wing A, Leeds General Infirmary Teaching Hospitals NHS Trust, Great George Street, Leeds LS1 3EX, UK
2. Academic Department of Microbiology, University of Leeds, School of Medicine, Old Medical School, Thoresby Place, Leeds General Infirmary Teaching Hospitals, Great George Street, Leeds LS1 3EX, UK