1. Hasselt University; Biomedical Research Institute (BIOMED) and transnationale Universiteit Limburg; School of Life Sciences; Diepenbeek Belgium
2. Department of Neurology; Middelheim Hospital; Antwerp Belgium
3. Laboratory of Neurochemistry and Behaviour; Department of Biomedical Sciences; Institute Born Bunge; University of Antwerp; Antwerp Belgium
4. Department of Neurology; University Medical Center Groningen; Groningen The Netherlands
5. School of Mental Health and Neuroscience; Maastricht University Medical Center; Maastricht the Netherlands
6. Department of Neurology; Orbis Medical Center; Sittard The Netherlands
7. Multiple Sclerosis and Rehabilitation Center; Overpelt Belgium
8. MS Centre Nijmegen (MSCN) and Department of Neurology; Radboud University Medical Centre; Nijmegen The Netherlands
9. Departments of Neurology and Laboratory Medicine; Radboud University Medical Center; Nijmegen The Netherlands
10. Department of Neurology; Cliniques Universitaires St-Luc; Université Catholique de Louvain; Brussels Belgium
11. Departments of Neurology and Immunology; Ramón y Cajal Hospital; Madrid Spain