1. Department of Cardiothoracic Surgery; Ullevål University Hospital; Oslo Norway
2. Faculty of Medicine, University of Oslo; Oslo Norway
3. Center for Heart Failure Research; University of Oslo; Oslo Norway
4. Department of Cardiology; Ullevål University Hospital; Oslo Norway
5. Department of Cardiac Surgery; The Royal Brompton Hospital; London UK
6. Institute for Experimental Medical Research; Ullevål University Hospital; Oslo Norway