1. Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
2. Department of Neurology and Rehabilitation Medicine, Skåne University Hospital, Lund, Sweden
3. Department of Clinical Neurosciences Lund, Faculty of Medicine, Lund University, Lund, Sweden
4. Department of Neurology and Clinical Neurophysiology, St. Olavs University Hospital, Trondheim, Norway
5. Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
6. Department of Clinical Chemistry and Pharmacology, Skåne University Hospital, Lund, Sweden
7. Division of Clinical Chemistry and Pharmacology, Lund University, Lund, Sweden