1. National Institute of Public Health, University of Southern
Denmark, Copenhagen, Denmark, hbh@niph.dk
2. Danish Multiple Sclerosis Registry, Copenhagen University
Hospital, Rigshospitalet, Copenhagen, Denmark, Department of Neurology, Aarhus University Hospital
in Aalborg, Aalborg, Denmark
3. Danish Multiple Sclerosis Registry, Copenhagen University
Hospital, Rigshospitalet, Copenhagen, Denmark, Institute of Regional Health Services Research, University
of Southern Denmark, Odense, Denmark, MS clinic of Southern Jutland, Vejle, Sønderborg
and Esbjerg, Denmark