1. Department of Clinical Chemistry, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
2. Alzheimer Center & Department of Neurology, Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
3. Department of Neurology, Department of Laboratory Medicine, Donders Institute for Brain, Cognition and behaviour, Alzheimer Centre Nijmegen, Radboud University Medical Centre, Nijmegen, The Netherlands
4. Department of Psychiatry and Neuropsychology, Alzheimer Center Limburg, University of Maastricht, Maastricht, The Netherlands
5. Department of Psychiatry, VU University Medical Center, Amsterdam, The Netherlands