1. Brain Center Rudolf Magnus and Center of Excellence for Rehabilitation Medicine, University Medical Center Utrecht and De Hoogstraat Rehabilitation, Utrecht, the Netherlands;
2. Center for Rehabilitation and Department of Rehabilitation Medicine, University of Groningen and University Medical Center Groningen, Groningen, the Netherlands;
3. Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands;
4. Brain Center Rudolf Magnus and Department of Neurology, University Medical Center Utrecht, Utrecht, the Netherlands