1. Department of Orthopaedic Surgery, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, UK.
2. Molecular Nutrition Group, Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen, UK.
3. Department of Trauma and Orthopaedic Surgery, Keele University School of Medicine, Hartshill, Stoke on Trent, Staffordshire, UK.