1. National Centre for Register-Based Research, Business and Social Sciences, Aarhus University , 8210 Aarhus V , Denmark
2. Centre for Integrated Register-based Research (CIRRAU), Business and Social Sciences, Aarhus University , 8210 Aarhus V , Denmark
3. Department of Clinical Medicine, University of Bergen , 5021 Bergen , Norway
4. Department of Clinical Epidemiology, Aarhus University and Aarhus University Hospital , 8200 Aarhus N , Denmark
5. Department of Economics and Business Economics, Business and Social Sciences, Aarhus University , 8210 Aarhus V , Denmark
6. Department of Neurology, Yale , New Haven, CT 06510 , USA
7. Department of Genetics, Yale , New Haven, CT 06510 , USA
8. Department of Neurology, Northwestern University – Feinberg School of Medicine , Chicago, IL 60611 , USA
9. Department of Neurology, Affiliated Member of the European Reference Network EpiCARE, Aarhus University Hospital , 8200 Aarhus N , Denmark
10. Department of Clinical Medicine, Aarhus University , 8200 Aarhus N , Denmark