1. Institute of Nursing Science, University of Basel, Bernoullistrasse 28, CH-4056 Basel, Switzerland
2. Division of Clinical Nursing Science, University Hospital of Basel, Petersgraben 4, CH-4031 Basel, Switzerland
3. Centre for Health Services and Nursing Research, Catholic University of Leuven, Kapucijnenvoer 35/4, B-3000 Leuven, Belgium
4. Department of Internal Medicine, University Hospital of Basel, University Hospital of Basel, Petersgraben 4, CH-4031 Basel, Switzerland