1. Department for Health, Centre for Analysis of Motion and Entertainment Research and Application (CAMERA), University of Bath, Bath BA2 7AY, UK
2. School of Allied Health Sciences, Griffith Centre of Biomedical and Rehabilitation Engineering (GCORE), Menzies Health Institute Griffith University, Gold Coast, Queensland 4222, Australia
3. Department for Health, University of Bath, Bath BA2 7AY, UK
4. Centre for Therapeutic Innovation, Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK