1. Institute of Nursing Science, University of Basel, Division of Clinical Nursing Science, University Hospital of Basel, CH, Bernoullistrasse 28, CH-4056 Basel, Switzerland
2. School of Nursing and the Leonard Davis Institute of Health Economics, University of Pennsylvania, 420 Guardian Drive, Philadelphia, PA, USA 19104-6096
3. Sharp HealthCare, 8695 Spectrum Center Blvd, San Diego, CA, USA 92123
4. School of Nursing, Campanile Drive, San Diego State University, San Diego, CA, USA 82182-4158
5. Center for Health Services and Nursing Research, Catholic University of Leuven, Kapucijnenvoer 35/4, B-3000 Leuven, Belgium