1 Primary Care Centre Versus Arthritis, School for Primary, Community and Social Care, Keele University, Staffordshire, ST5 5BG, UK. a.r.machin@keele.ac.uk.
2 Primary Care Centre Versus Arthritis, School for Primary, Community and Social Care, Keele University, Staffordshire, ST5 5BG, UK.
3 Haywood Academic Rheumatology Centre, Midlands Partnership Foundation Trust, Staffordshire, UK.
4 West Midlands CLAHRC, West Midlands, UK.
5 Midlands Partnership Foundation Trust, Staffordshire, UK.