1. Faculty of Medicine, University of Oslo, Oslo, Norway;
2. Department of Medical Biochemistry, Oslo University Hospital, Ullevaal, Oslo, Norway;
3. Section of Cardiovascular and Renal Research, Oslo University Hospital, Ullevaal, Oslo, Norway;
4. Department of Cardiology, Oslo University Hospital, Ullevaal, Oslo, Norway;
5. Department of Internal Medicine, Oslo University Hospital, Ullevaal, Oslo, Norway;
6. Department of Nephrology, Oslo University Hospital, Ullevaal, Oslo, Norway;
7. Center for Medical Ethics, University of Oslo, Oslo, Norway