1. Section for Cardiothoracic Surgery; Department of Anesthesia and Intensive Care; Haukeland University Hospital; Bergen Norway
2. Department of Clinical Medicine; Faculty of Medicine and Dentistry; University of Bergen; Bergen Norway
3. Section for Cardiothoracic Surgery; Department of Heart Disease; Haukeland University Hospital; Bergen Norway
4. Department of Clinical Science; Faculty of Medicine and Dentistry; University of Bergen; Bergen Norway