1. Department of Occupational Medicine and Public Health; the Faroese Hospital System; Tórshavn Faroe Islands
2. Centre for Applied Neurogenetics; Djavad Mowafhagian Centre for Brain Health, Department of Medical Genetics, University of British Columbia; Vancouver BC Canada
3. St. Olav's Hospital, Department of Neuroscience; Norwegian University of Science and Technology; Trondheim Norway