1. Department of Neurology; MCH Westeinde; The Hague The Netherlands
2. Department of Clinical chemistry; LabWest/MCH Westeinde; The Hague The Netherlands
3. Department of Neurology; LUMC; Leiden The Netherlands
4. Department of Clinical Epidemiology; LUMC; Leiden The Netherlands
5. Department of Neurology and Neurosurgery; Brain Center Rudolph Magnus; UMC Utrecht; Utrecht The Netherlands
6. Julius Center for Health Sciences and Patient Care; UMC Utrecht; Utrecht The Netherlands