1. Department of Neurology, Radboud University Nijmegen Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Alzheimer Centre Nijmegen, The Netherlands
2. Biobank, Born Bunge Institute, University of Antwerp, Wilrijk, Belgium
3. Department of Neurology, University Medical Centre Groningen, The Netherlands
4. Department of Laboratory Medicine, Radboud University Nijmegen Medical Centre, The Netherlands