| Affiliation: | 1. Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark;2. Rigshospitalet, The Danish Multiple Sclerosis Registry, Copenhagen, Denmark;3. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark;4. Department of Neurology, Multiple Sclerosis Clinic of Southern Jutland (S?nderborg, Vejle, Esbjerg), S?nderborg, Denmark;5. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark;6. Department of Neurology, Neuroscience Centre, Rigshospitalet, Danish Multiple Sclerosis Research Centre, Copenhagen, Denmark;7. University of Aarhus, Department of Clinical Epidemiology, Clinical Institute, Aarhus, Denmark |
