1. German Center for Neurodegenerative Diseases (DZNE), Site Rostock/ Greifswald, Greifswald, Germany
2. Department of Health and Nursing, Campus Alt-Saarbrücken, University of Applied Sciences, School of Social Sciences, Saarbrücken, Germany
3. German Center for Neurodegenerative Diseases (DZNE), Site Witten, Witten, Germany
4. Institute for Applied Social Sciences (IfaS), Baden-Wuerttemberg Cooperative State University Stuttgart, Fakultät Sozialwesen, Stuttgart, Germany
5. Institute for Public Health and Nursing Research (IPP), University of Bremen, Bremen, Germany
6. Institute for Community Medicine (ICM), University Medicine Greifswald, Greifswald, Germany