1. School of Sport, Performing Arts and Leisure, University of Wolverhampton, Walsall
2. Department of Rheumatology, Dudley Group of Hospitals NHS Trust, Russell's Hall Hospital, Dudley, West Midlands
3. Research Institute in Physical Performance and Rehabilitation, Centre for Research and Technology, Thessaly, Trikala, Greece
4. ARC Epidemiology Unit, University of Manchester, Manchester, UK