1. Department of Cardiothoracic Surgery, Landspitali University Hospital, Reykjavik, Iceland;
2. Department of Anesthesiology, Duke University Hospital, Durham, NC, USA;
3. Department of Anaesthesiology and Intensive Care, Uppsala University Hospital, Uppsala, Sweden;
4. Section of Cardiac Surgery, Yale University School of Medicine, New Haven, CT, USA;
5. Faculty of Medicine, University of Iceland, Reykjavik, Iceland;
6. Department of Cardiology, Landspitali University Hospital, Reykjavik, Iceland