1 Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway.
2 Institute for Experimental Medical Research, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; K.G. Jebsen Cardiac Research Centre, Faculty of Medicine, University of Oslo, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway.
3 Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.
4 K.G. Jebsen Cardiac Research Centre, Faculty of Medicine, University of Oslo, Oslo, Norway; Center for Heart Failure Research, Faculty of Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway; Department of Pharmacology, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway. Electronic address: f.o.levy@medisin.uio.no.