1. Centre for Biomechanics and Rehabilitation Technologies, Staffordshire University, Stoke on Trent ST4 2DF, UK
2. ScolioCentar, Novisad, 403916 Novi Sad, Serbia
3. Centre for Biomechanics, University Hospitals of North Midlands NHS Trust, Stoke on Trent ST4 6QG, UK
4. Royal Wolverhampton NHS Trust, Wolverhampton WV10 0QP, UK