1. Research Unit of Surgery, Anaesthesia and Intensive Care, University of Oulu, Medical Research Center, Oulu, Finland
2. Department of Obstetrics and Gynecology, Oulu University Hospital, Oulu, Finland
3. Department of Pathology, Oulu University Hospital, Oulu, Finland
4. Heart Center, University of Turku, Turku University Hospital, Turku, Finland
5. Department of Cardiac Surgery, Heart and Lung Center, Helsinki University Central Hospital, Helsinki University Hospital, Helsinki, Finland