1. Reader in Rheumatology, Research Institute for Primary Care and Health Sciences, Keele University, Keele, Staffordshire, ST5 5BG, UK; and Haywood Academic Rheumatology Centre, Staffordshire and Stoke-on-Trent Partnership Trust, UK
2. Research Institute for Primary Care and Health Sciences, Keele University, Keele, UK; and School of Allied Health, College of Science, Health and Engineering, La Trobe University, Melbourne, Victoria, Australia