1. Arthritis Research UK Primary Care Centre, Research Institute for Primary Care and Health Sciences and Keele Clinical Trials Unit, Keele University, Staffordshire, UK
2. Derby Shoulder Unit, University Hospitals Derby & Burton NHS Foundation Trust, Derby, UK
3. Aneurin Bevan University Health Board, Caerleon, UK
4. Liverpool Upper Limb Unit, Royal Liverpool University Hospital, Liverpool, UK
5. English Institute of Sport, Manchester, UK
6. Royal National Orthopaedic Hospital, Middlesex, UK
7. Sheffield Shoulder and Elbow Unit, Sheffield Teaching Hospital NHS Trust, Sheffield, UK
8. West Herts Shoulder Service, West Hertfordshire Hospital Trust, St Albans Herts, Spire Healthcare, Spire Bushey Hospital, Hertfordshire, UK
9. Nottingham Shoulder & Elbow Unit, Nottingham University Hospitals NHS Trust, Nottingham, UK