1. Department of Disability Services The Wellbeing Services County of Southwest Finland Paimio Finland
2. Department of Radiology University of Turku and Turku University Hospital Turku Finland
3. Center for Statistical Genetics, Gertrude H. Sergievsky Center, and the Department of Neurology Columbia University Medical Center New York New York USA
4. Taub Institute, Columbia University Medical Center New York New York USA
5. Department of Medical Genetics University of Helsinki Helsinki Finland
6. Department of Neurology Päijät‐Häme Joint Municipal Authority Lahti Finland
7. General Practice, Turku University and Turku University Central Hospital Turku Finland