1. Biomedical Research Institute and Transnationale Universiteit Limburg; Hasselt University; Diepenbeek Belgium
2. Departments of Neurology and Immunology; Ramón y Cajal Hospital; Madrid Spain
3. Multiple Sclerosis and Rehabilitation Center; Overpelt Belgium
4. Institute of Neurosciences; Neurochemistry Unit; Université Catholique de Louvain; Brussels Belgium