1. Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg , Gothenburg, Sweden
2. Department of Cardiothoracic Surgery, Sahlgrenska University Hospital , Gothenburg, Sweden
3. Department of Cardiology, Blekinge Hospital , Karlskrona, Sweden
4. Department of Neurology, Sahlgrenska University Hospital , Gothenburg, Sweden
5. Faculty of Medicine, University of Iceland , Reykjavik, Iceland
6. Department of Cardiothoracic Surgery , Landspitali, Reykjavik, Iceland