1. Roessingh Research and Development, Enschede, The Netherlands.
2. Rehabilitation Centre “Het Roessingh” Enschede, The Netherlands.
3. Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands.
4. Biomechatronics & Bio-Robotics Group, Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands.