1. Brain Center Rudolf Magnus, Department of Neurology, University Medical Center Utrecht, Utrecht, The Netherlands
2. Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands
3. Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands
4. Department of Geriatrics, University Medical Center Utrecht, Utrecht, The Netherlands
5. Departments of Neurology and Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands