1. Department of Immunobiology, Biomedical Primate Research Centre, P.O. Box 3306, 2280 GH Rijswijk, The Netherlands
2. MS Centre ErasMS, Rotterdam, Dr. Molewaterplein 50, 3015 GE Rotterdam, The Netherlands
3. Image Sciences Institute, University Medical Center Utrecht, Yalelaan 2, 3584 CM Utrecht, The Netherlands
4. Center for Brain Research, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria
5. Department of Medical Physiology, University Medical Centre Groningen, P.O. Box 72, 9700 AB, Groningen, The Netherlands