1. Addenbrooke’s Hospital, Hills Road, Cambridge CB2 0QQ, UK.
2. Nuffield Orthopaedic Centre, Windmill Road, Headington, Oxford OX3 7HE, UK.
3. Notre Dame Medical School, 160 Oxford Street, Darlinghurst, Sydney, New South Wales 2010, Australia.
4. Australian Institute of Musculoskeletal Research, Unit 2/12 Fredrick Street, St Leonards, Sydney, New South Wales, Australia.
5. Sydney, New South Wales, Australia.