1. Department of Cardiothoracic Surgery Landspitali University Hospital Reykjavik Iceland
2. Faculty of Medicine University of Iceland Reykjavik Iceland
3. Department of Cardiothoracic Surgery and Anaesthesia Uppsala University Hospital Uppsala Sweden
4. Department of Anaesthesia and Critical Care Landspitali University Hospital Reykjavik Iceland
5. Department of Cardiology Sahlgrenska University Hospital Gothenburg Sweden
6. Department of Molecular and Clinical Medicine Institute of Medicine Sahlgrenska AcademyUniversity of Gothenburg Gothenburg Sweden
7. Department of Cardiothoracic Surgery Sahlgrenska University Hospital Gothenburg Sweden
8. Department of Cardiothoracic and Vascular Surgery Department of Clinical Medicine Aarhus University Hospital Aarhus Denmark
9. Department of Cardiothoracic and Vascular Surgery, Department of Clinical Medicine Odense University Hospital, University of Southern Denmark Odense Denmark