1. Mental Health Center Friesland; Department of Old Age Psychiatry; Leeuwarden the Netherlands
2. University of Groningen; University Medical Center Groningen; University Center for Psychiatry; Groningen the Netherlands
3. University Medical Centre St. Radboud; Department of Psychiatry; Nijmegen the Netherlands
4. Nijmegen Mental Health Centre; Pro Persona; Nijmegen the Netherlands
5. VU University Medical Center/GGZinGeest; Department Psychiatry/EMGO Institute for Health and Care Research; Amsterdam the Netherlands
6. University of Groningen; University Medical Center Groningen; Department of Neurology; Alzheimer Research Center; Groningen the Netherlands
7. Mental Health Care Center GGNet; Department of Old Age Psychiatry; Apeldoorn the Netherlands