1 Division of Cardiovascular and Pulmonary Diseases, Department of Cardiology and Institute for Surgical Research, Center for Heart Failure Research and KG Jebsen Cardiac Research Centre Oslo, Oslo University Hospital, University of Oslo, Rikshospitalet, N-0027 Oslo, Norway osmiseth@ous-hf.no otto.smiseth@rikshospitalet.no o.a.smiseth@medisin.uio.no.