1. Department of Rehabilitation Medicine, Neurosciences, MS Center Amsterdam, Amsterdam University Medical Center, Amsterdam, the Netherlands
2. Nieuw Unicum, Zandvoort, the Netherlands
3. From the Department of Rehabilitation Medicine, Amsterdam Movement Sciences, MS Center Amsterdam, Amsterdam University Medical Center, Amsterdam, the Netherlands
4. Department of Neurology, Neurosciences, MS Center Amsterdam, Amsterdam University Medical Center, Amsterdam, the Netherlands