1. Department of Cardiology, Helsinki University Hospital, Helsinki, Finland
2. Department of Public Health, University of Helsinki, Helsinki, Finland
3. Department of Cardiac Surgery, New Children’s Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland
4. Heart Center, Kuopio University Hospital, Kuopio, Finland
5. Department of Cardiology, Tampere University Hospital, Tampere, Finland
6. Heart Centre, Turku University Hospital, Turku, Finland
7. Department of Cardiology, Oulu University Hospital, Oulu, Finland
8. Department of Cardiology, New Children’s Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland
9. Department of Cardiothoracic Surgery, Turku University Hospital, Turku, Finland