1. Department of Cardiothoracic and Vascular Surgery and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
2. Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
3. Department of Cardiothoracic Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
4. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
5. Department of Cardiology and Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
6. Department of Clinical Chemistry, and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden