1: Department of Sport and Exercise Science, University of Thessaly, Trikala, Greece
2: Institute of Human Performance & Rehabilitation, Centre for Research and Technology Thessaly, Trikala, Greece
3: Department of Rheumatology, Dudley Group NHS Foundation Trust, Russell’s Hall Hospital, Dudley, West Midlands, UK
4: School of Sport, Performing Arts & Leisure, Wolverhampton University, West Midlands, UK
5: Arthritis Research UK Epidemiology Unit, University of Manchester, Manchester, UK