[1] University of Lübeck,Institute of Social Medicine and Epidemiology, Nursing Research Unit
[2] University Hospital Düsseldorf,Institute for Health Services Research and Health Economics, Centre for Health and Society, Medical Faculty
[3] Heinrich-Heine-University Düsseldorf,Institute for Health and Nursing Science, Medical Faculty
[4] Martin Luther University Halle- Wittenberg,School of Nursing Science, Faculty of Health
[5] Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE),Institute of Nursing Science, Faculty of Medicine
[6] Witten/Herdecke University,undefined
[7] University of Cologne,undefined
[8] University Hospital Cologne,undefined