1. Department of Clinical Medicine – Neurology, Aarhus University, Aarhus N, Denmark
2. Research Unit for General Practice, Aarhus C, Denmark
3. Department of Public Health, Aarhus University, Aarhus C, Denmark
4. Danish Center for Clinical Health Services Research, Department of Clinical Medicine, Aalborg University and Aalborg University Hospital, Aalborg, Denmark
5. Department of Neurology, Regional Hospital of West Jutland, Holstebro, Denmark