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