1. Department of Clinical Neurology, University of Nottingham, UK
2. Department of Neurology, National Competence Centre for Multiple Sclerosis, Haukeland University Hospital, Bergen, Norway, Department of Pathology, Vrije Universiteit Medical Centre, Amsterdam, The Netherlands
3. Department of Economics, University of Nottingham, UK
4. Multiple Sclerosis Centre, Vrije Universiteit Medical Centre, Amsterdam, The Netherlands
5. Department of Neuropathology, University of Nottingham, UK
6. Department of Neurology, Nottingham University Hospital, UK,