1. Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
2. Department of Clinical Science, University of Bergen, Bergen, Norway
3. Cardiac Surgical Research, The Rayne Institute (King's College London), Guy's and St Thomas' NHS Foundation Trust, St Thomas' Hospital, London, UK
4. Institute of Physiological Chemistry, Center of Physiological Medicine, Medical University Graz, Graz, Austria
5. Department of Biomedical Research, Ludwig Boltzmann Cluster for Cardiovascular Research, Medical University of Vienna, Vienna, Austria