1. Danish Multiple Sclerosis Centre (DMSC), Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
2. Danish Research Centre for Magnetic Resonance (DRCMR), Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
3. The Research Unit for General Practice and Section of General Practice, Department of Public Health, University of Copenhagen, Copenhagen, Denmark