1. Center for Health Services and Nursing Research; Catholic University of Leuven; Kapucijnenvoer 35/4 B-3000 Leuven Belgium
2. Institute of Nursing Science; University of Basel; Bernoullistrasse 28 CH-4056 Basel Switzerland
3. Department of Geriatrics; University Hospitals of Leuven; Herestraat 49 B-3000 Leuven Belgium
4. Department of Cardiology; University Hospitals of Leuven; Herestraat 49 B-3000 Leuven Belgium