1. Department of Clinical Chemistry, VU University Medical Center, Amsterdam, The Netherlands
2. Alzheimer Center, VU University Medical Center, Amsterdam, The Netherlands
3. Department of Neurology, VU University Medical Center, Amsterdam, The Netherlands
4. TNO Quality of Life, Business Unit Biosciences, Gaubius Laboratory, Leiden, The Netherlands
5. Department of Psychiatry, VU University Medical Center, Amsterdam, The Netherlands