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