1. Department of Clinical Sciences, Lund University, Skane University Hospital, Lund, Sweden;
2. Department of Cardiothoracic Surgery, Lund University, Skane University Hospital, Lund, Sweden;
3. Department of Thoracic and Cardiovascular Surgery, Aarhus University Hospital, Skejby, Denmark;
4. Department of Thoracic and Cardiovascular Surgery, Karolinska University Hospital, Stockholm, Sweden;
5. Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;
6. Heart Centre, Tampere University Hospital, Tampere, Finland;
7. Heart Centre, Turku University Hospital and University of Turku, Turku, Finland;
8. Section of Cardiac Surgery, Yale University School of Medicine, New Haven, CT, USA;
9. Department Cardiothoracic and Vascular Surgery, Orebro University Hospital and School of Health and Medicine, Orebro University, Orebro, Sweden;
10. Department of Cardiothoracic Surgery, Landspitali University Hospital and Faculty of Medicine, University of Iceland, Reykjavik, Iceland