1. Department of Occupational Medicine and Public Health, the Faroese Hospital System, Tórshavn, Faroe Islands
2. Neurological Department, University Hospital Copenhagen, Rigshospitalet and Bispebjerg Hospital, Copenhagen, Denmark
3. The Genetic Biobank of the Faroe Islands, Torshavn, Faroe Islands
4. General Medical Department, National Hospital of the Faroe Islands, Tórshavn, Faroe Islands
5. Department of Medicine and Neurophysiological Laboratory, National Hospital of the Faroe Islands, Tórshavn, Faroe Islands
6. The Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark