1. University Hospitals KU-Leuven, Department of Internal Medicine, Leuven, Belgium.
2. Center of Health Services and Nursing Research, School for Public Health, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium.
3. Rega Institute, Katholieke Universiteit Leuven, Leuven, Belgium.
4. Department of Sociology, University of Gent, Gent, Belgium.
5. Institute of Nursing Science, University of Basel, Basel, Switzerland.