1. Clinic of Cardiology, St. Olavs Hospital, Trondheim University Hospital , Prinsesse Kristinas gate 3, 7030 Trondheim , Norway
2. Department of Cardiothoracic Surgery, St. Olavs Hospital, Trondheim University Hospital , Prinsesse Kristinas gate 3, 7030 Trondheim , Norway
3. Department of Public Health and Nursing, Norwegian University of Science and Technology , P.O. Box 8900, Torgarden, 7491 Trondheim , Norway
4. Department of Clinical Pharmacology, St. Olavs Hospital, Trondheim University Hospital , Prinsesse Kristinas gate 3, 7030 Trondheim , Norway
5. Department of Anaesthesia and Intensive Care, St. Olavs Hospital, Trondheim University Hospital , Prinsesse Kristinas gate 3, 7030 Trondheim , Norway
6. Department of Circulation and Medical Imaging, Norwegian University of Science and Technology , P.O. Box 8900, Torgarden, 7491 Trondheim , Norway