1. Rehabilitation Engineering and Aids for Living Unit, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, England
2. South-east Mobility and Rehabilitation Technology Centre, NHS Lothian, Edinburgh, Scotland
3. School of Engineering and Physical Sciences, Department of Mechanical Engineering, Heriot-Watt University, Edinburgh, Scotland
4. Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire, England