1. Deutsches Zentrum für Neurodegenerative Erkrankungen e.V. (DZNE) site Witten, Witten, Germany
2. Department of Nursing Science, Faculty of Health, University of Witten/Herdecke, Witten, Germany
3. Department of Psychiatry and Neuropsychology/Alzheimer Centre Limburg, School of Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands
4. Institute for Public Health and Nursing Science, University of Bremen, Bremen, Germany
5. Department of Medicine for Older People Amsterdam UMC, Amsterdam, The Netherlands.