1. From the Department of Neurology, MS Center,
2. From the Department of Neurology, MS Center, the 2Department of Clinical Epidemiology and Biostatistics, and
3. From the Department of Neurology, MS Center, the 3Department of Anatomy and Neuroscience, Section of Clinical Neuroscience, VU University Medical Center, Amsterdam, The Netherlands; and
4. the Department of Clinical Epidemiology and Biostatistics, and
5. From the Department of Neurology, MS Center, the 4Department of Neuroimmunology, UCL Institute of Neurology, London, United Kingdom.