1 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK. Electronic address: c.jinks@keele.ac.uk.
2 Musculoskeletal Research International, Key Biscayne, Florida, USA. Electronic address: drvanbemden@gmail.com.
3 School of Health Sciences and Social Work, Griffith University, Brisbane, Australia; Physiotherapy Department, Royal Brisbane and Women's Hospital, Brisbane, Australia. Electronic address: s.bunzli@griffith.edu.au.
4 Sydney Musculoskeletal Health, Kolling Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia; Rheumatology Department, Royal North Shore Hospital, Northern Sydney Local Health District, Sydney, NSW, Australia. Electronic address: jocelyn.bowden@sydney.edu.au.
5 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK; Physiotherapy Department, Melbourne School of Health Sciences, The University of Melbourne, Melbourne, Australia. Electronic address: thorlene.egerton@unimelb.edu.au.
6 Sydney Musculoskeletal Health, Kolling Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia; Rheumatology Department, Royal North Shore Hospital, Northern Sydney Local Health District, Sydney, NSW, Australia. Electronic address: jillian.eyles@sydney.edu.au.
7 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK; School of Clinical Science, Auckland University of Technology, Auckland, New Zealand. Electronic address: n.foster@uq.edu.au.
8 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK. Electronic address: e.healey@keele.ac.uk.
9 Research Users' Group, Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK. Electronic address: jamaddisonuk@gmail.com.
10 School of Clinical Science, Auckland University of Technology, Auckland, New Zealand. Electronic address: daniel.obrien@aut.ac.nz.
11 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK; Research Users' Group, Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK. Electronic address: j.quicke@uq.edu.au.
12 Department of General Practice, University Medical Center Rotterdam Erasmus MC, Rotterdam, The Netherlands. Electronic address: d.schiphof@erasmusmc.nl.
13 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK. Electronic address: e.parry@keele.ac.uk.
14 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK; Haywood Academic Rheumatology Centre, Midlands Partnership University NHS Foundation Trust, Haywood Hospital, Staffordshire ST6 7AG, UK. Electronic address: m.thomas@keele.ac.uk.
15 Primary Care Centre Versus Arthritis, School of Medicine, Keele University, Staffordshire ST5 5BG, UK. Electronic address: m.holden@keele.ac.uk.