1. Kennedy Institute, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of OxfordOxford UK
2. Queen Elizabeth Hospital, Gateshead, UK, and University of Exeter Medical SchoolExeter UK
3. Queen Elizabeth HospitalGateshead UK
4. Newcastle University and The Freeman HospitalNewcastle UK
5. University of Exeter Medical SchoolExeter UK
6. Royal Cornwall HospitalTruro UK