1. Department of Radiology and Nuclear Medicine Maastricht University Medical Center PO box 5800 Maastricht 6202 AZ The Netherlands
2. Department of Neuropsychology and Psychiatry/Alzheimer Center Limburg Maastricht University Medical Center PO box 616 Maastricht 6200 MD The Netherlands
3. School for Mental Health and Neuroscience Maastricht University PO box 616 Maastricht 6200 MD The Netherlands
4. Department of Radiology Leiden University Medical Center PO box 9600 Leiden 2300 RC The Netherlands
5. Department of Gerontology and Geriatrics Leiden University Medical Center PO box 9600 Leiden 2300 RC The Netherlands