1. Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Witten, Germany
2. Faculty of Health, School of Nursing Science, Witten/Herdecke University, Witten, Germany
3. Diakonie Osnabrück, Stadt und Land gGmbh, Osnabrück, Germany
4. College of Nursing, Pennsylvania State University, University Park, Pennsylvania, USA
5. Department of Sociology and Gerontology, Miami University, Oxford, Ohio, USA
6. Scripps Gerontology Center, Miami University, Oxford, Ohio, USA