1. Department of Biomechanical Engineering, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, CD, The Netherlands
2. Department of Rehabilitation Medicine, Leiden University Medical Center, Leiden, RC, The Netherlands
3. InteSpring BV, Rijswijk, EX, The Netherlands
4. Department of Rehabilitation Medicine, Spaarne Gasthuis Hoofddorp, Hoofddorp, TM, The Netherlands
5. Department of Biomechanical Engineering, Faculty of Engineering Technology, University of Twente, Enschede, AE, The Netherlands