1. Department of Heart Disease, Haukeland University Hospital , Bergen , Norway
2. Institute of Health and Caring Sciences, Western Norway University of Applied Sciences , Bergen , Norway
3. Clinic of Cardiology, St Olav University Hospital , Trondheim , Norway
4. College of Nursing and Health Sciences, Caring Futures Institute, Flinders University , Adelaide , Australia
5. Centre for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital , Adelaide , Australia
6. Department of Cardiology, Herlev and Gentofte University Hospital , Gentofte , Denmark
7. Institute of Nursing and Nutrition, University College Copenhagen , Copenhagen , Denmark