1. Haukeland University Hospital, Department of Heart Disease, N-5021 Bergen, Norway kjersti.oterhals@helse-bergen.no
2. Department of Public Health and Primary Health Care, Section of Nursing Science, University of Bergen, Norway
3. Department of Public Health and Primary Health Care, Section of Nursing Science, University of Bergen, Norway, Centre for Clinical Research, Haukeland University Hospital, Bergen, Norway
4. Haukeland University Hospital, Department of Heart Disease, N-5021 Bergen, Norway, Centre for Clinical Research, Haukeland University Hospital, Bergen, Norway