1. Radboud university medical center, Scientific center for quality of healthcare (IQ healthcare), Nijmegen, The Netherlands.
2. Radboud university medical center, Department of Geriatric Medicine, Nijmegen, The Netherlands.
3. Coöperatie Volksgezondheidszorg, Business intelligence services, Arnhem, The Netherlands.
4. Radboud university medical center, Donders Institute for Brain, Cognition and Behaviour, Department of Geriatric Medicine, Radboud Alzheimer Centre, Nijmegen, The Netherlands.