1. 1Danish Pain Research Center, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
2. 2Steno Diabetes Center Aarhus, Aarhus University Hospital, Aarhus, Denmark
3. 3Department of Clinical Biochemistry, Aarhus University Hospital, Aarhus, Denmark
4. 4Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
5. 5Department of Public Health, Aarhus University, Aarhus, Denmark
6. 6Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark
7. 7Department of Neurology, University of Basel, Basel, Switzerland
8. 8Multiple Sclerosis Center and Research Center for Clinical Neuroimmunology and Neuroscience Basel, University Hospital Basel, Basel, Switzerland