1. Department of Trauma and Orthopaedics, Royal Liverpool Hospitals, Prescot St, Liverpool, Merseyside L7 8XP, UK
2. The Pulvertaft Hand Centre, Royal Derby Hospital, Kings Treatment Centre (KTC), Uttoxeter Road, Derby DE22 3NE, UK
3. Department of Rheumatology, Royal Derby Hospital, Uttoxeter Road, Derby DE22 3NE, UK