1 Department of Medicine, Diakonhjemmet Hospital, Oslo, Norway.
2 Institute for Surgical Research, Oslo University Hospital, Oslo, Norway.
3 Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway.
4 Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway.
5 Institute for Experimental Medical Research and KG Jebsen Center for Cardiac Research, Oslo University Hospital and University of Oslo, Oslo, Norway.