1. GGNet Old age, Radboud University Medical Center, Nijmegen, The Netherlands
2. GGNet Mental Health, Division of Old Age Psychiatry, Warnsveld & Apeldoorn, The Netherlands
3. Behavioural Science Institute, Radboud University & Pro Persona Institute for Integrated Mental Health Care, Nijmegen, The Netherlands
4. Mental Health Center GGZ Centraal, Ermelo, Netherlands
5. The Department of Psychiatry Amsterdam UMC, VU University Medical Center, Amsterdam Public Health Research Institute, Amsterdam, Netherlands
6. Mental Health Center GGZ Drenthe, Assen, The Netherlands
7. Mediant Mental Health Center, Enschede, The Netherlands
8. Rob Giel Research Center (RGOc), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
9. Department of Psychiatry, Radboud University Medical Center, Nijmegen, The Netherlands