1. Heart Hospital, Tampere University Hospital, Faculty of Medicine and Health Technology, Tampere, Finland
2. Heart Center, Turku University Hospital, Turku, Finland
3. Heart Center, Kuopio University Hospital, Kuopio, Finland
4. Heart Center, Helsinki University Hospital, Helsinki, Finland
5. Department of Internal Medicine, Oulu University Hospital, Oulu, Finland
6. Department of Surgery, Oulu University Hospital, University of Oulu, Oulu, Finland
7. National Centre of Global Health, Istituto Superiore di Sanità, Rome, Italy
8. Department of Surgery, University of Turku, Turku, Finland