1. Institute of Psychology, Health, Medical and Neuropsychology Unit, Leiden University, Leiden, The Netherlands
2. Department of Care Ethics, University of Humanistic Studies, Utrecht, The Netherlands
3. National Multiple Sclerosis Foundation, Rotterdam, The Netherlands
4. Department of Neurology, Elisabeth-TweeSteden Hospital, Tilburg, The Netherlands
5. MS4 Research Institute, Nijmegen, The Netherlands
6. Department of Community & Occupational Medicine, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
7. Department of Rehabilitation Medicine, Centre for Rehabilitation, University of Groningen, University Medical Centre Groningen, Haren, The Netherlands
8. Department of Social and Behavioural Sciences, Tranzo Scientific Centre for Care and Welfare, Tilburg University, Tilburg, The Netherlands
9. Optentia, North West University of South Africa, Vanderbijlspark, South Africa
10. Department of Neurology, Medical Centre Leeuwarden, Leeuwarden, The Netherlands
11. Department of Neurology, Jeroen Bosch Hospital, ‘s-Hertogenbosch, The Netherlands
12. Department of Neurology, St Antonius Hospital, Nieuwegein, The Netherlands
13. Department of Neurology, Alrijne Hospital Leiden, Leiden, The Netherlands
14. Department of Neurology, Zuyderland Medical Centre, Sittard-Geleen, The Netherlands
15. Department of Neurology, Rijnstate Hospital, Arnhem, The Netherlands
16. Department of Neurology, Canisius-Wilhelmina Hospital, Nijmegen, The Netherlands
17. Department of Human Genetics, Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands
18. Department of Neurology & Neuropsychology, Leiden University Medical Centre, Leiden, The Netherlands