1. Alzheimer CenterVU University Medical CenterAmsterdamThe Netherlands
2. Department of NeurologyVU University Medical CenterAmsterdamThe Netherlands
3. Department of Psychiatry and Neuropsychology/Alzheimer Center LimburgSchool for Mental Health and Neurosciences, Maastricht University Medical CenterMaastrichtThe Netherlands
4. Department of Clinical ChemistryVU University Medical CenterAmsterdamThe Netherlands
5. Department of Epidemiology/BiostatisticsVU University Medical CenterAmsterdamThe Netherlands