1. Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
2. Department of Occupational and Environmental Medicine, Bispebjerg and Frederiksberg Hospital, University of Copenhagen, Copenhagen, Denmark
3. Danish Center for Clinical Health Services Research, Department of Clinical Medicine, Aalborg University and Aalborg University Hospital, Aalborg, Denmark
4. Hammel Neurorehabilitation Centre and University Research Clinic, Aarhus University, Aarhus, Denmark
5. Department of Public Health, Section of Environmental Health, University of Copenhagen, Copenhagen, Denmark