1. Institute of Health and Nursing Science, Medical Faculty, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
2. Center for Dementia Care, Institute of Nursing Science, Department of Health, Eastern Switzerland University of Applied Sciences, St.Gallen, Switzerland
3. Department of Clinical Research, University Hospital Basel, University of Basel, Basel, Switzerland
4. Institute of General Practice and Family Medicine, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany