1. Kaiser Permanente, Advanced Heart Failure Therapies, Santa Clara, California, USA
2. Institute of Nursing Science, Department of Public Health, Faculty of Medicine, University of Basel, Basel, Switzerland
3. Academic Centre for Nursing and Midwifery, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
4. School of Nursing, University of Missouri-Kansas City, Kansas City, Missouri, USA