1. Department of Medical and Health Sciences, Linköping University, 581 83 Linköping, Sweden
2. Department of Cardiothoracic Surgery, Linköping University, Linköping, Sweden
3. Department of Cardiothoracic Surgery, Clinical Sciences, Lund University, 221 85 Lund, Sweden
4. Department of Cardiothoracic Surgery/THAI, Skåne University Hospital and Medical Services, 221 85 Lund, Sweden
5. School of Health Sciences, Jönköping University, 551 11 Jönköping, Sweden