1. GROW Gerontological Research on Well-Being, Faculty of Medicine and Faculty of Human Sciences, University of Cologne, Cologne, Germany.
2. Health Care Managment, Central Krankenversicherung AG, Cologne, Germany.
3. Generali Health Solutions GmbH, Cologne, Germany.
4. Department of Educational Science, Mixed Methods-Research, PH Heidelberg, University of Education, Heidelberg, Germany.
5. Faculty of Medicine, Aging Clinical Research, Department Medicine II of Internal Medicine and Center for Molecular Medicine Cologne, University Hospital Cologne, Cologne, Germany.
6. Faculty of Medicine, Research Unit Ethics, University Hospital Cologne, Cologne, Germany.
7. ceres—Cologne Center for Ethics, Rights, Economics, and Social Sciences of Health, University of Cologne, Cologne, Germany.