1. Department of Biomedicine; Aarhus University; Bartholin Building, Wilhelm Meyers Allé 4 DK-8000 Aarhus C Denmark
2. Department of Neurology; Aarhus University Hospital; Nørrebrogade 44 DK-8000 Aarhus C Denmark
3. Department of Clinical Biochemistry; Aarhus University Hospital; Palle Juul Jensens Boulevard 99 DK-8200 Aarhus N Denmark