1 School of Sport, Rehabilitation and Exercise Sciences, University of Essex, Colchester, UK.
2 School of Physiotherapy, University of Notre Dame Australia, Fremantle, Western Australia, Australia.
3 Department of Physiotherapy, School of Primary Health Care, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia.
4 Centre for Sports and Exercise Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
5 Arthritis Research UK Primary Care Centre, Research Institute for Primary Care and Health Sciences and Keele Clinical Trials Unit, Keele University, Keele, UK.