1. Department of Neurology, Aarhus University Hospital, Aarhus, Denmark
2. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
3. The National Centre for Register-Based Research, Department of Economics and Business Economics, Business and Social Sciences, Aarhus University, Aarhus, Denmark
4. The Centre for Integrated Register-Based Research, Aarhus University, Aarhus, Denmark