1. Institute of Nursing Science, Medical University of Graz, Billrothgaße 6, 8010 Graz, Austria
2. Department of Health Services Research Focusing on Chronic Care and Ageing, Section of Nursing Science, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands
3. Department of Nursing and Management, Faculty of Business & Social Sciences, Hamburg University of Applied Sciences, Alexanderstraße 1, 20099 Hamburg, Germany
4. Department of Nursing and Health Sciences, Protestant University of Applied Sciences, Zweifalltorweg 12, 64293 Darmstadt, Germany