1. Obstetrics, and Gynecology; Women's Hospital; University of Helsinki and Helsinki University Hospital; Helsinki Finland
2. Pediatric Cardiology; Children's Hospital; University of Helsinki and Helsinki University Hospital; Helsinki Finland
3. Finnish Register of Congenital Malformations; Information Services Department; National Institute for Health and Welfare THL; Helsinki Finland
4. Pediatric Surgery; Children's Hospital; Helsinki University and Helsinki University Hospital; Helsinki Finland
5. Pediatric Cardiac Surgery; Children's Hospital; Helsinki University and Helsinki University Hospital; Helsinki Finland
6. Anesthesia and Intensive Care; Children's Hospital; Helsinki University and Helsinki University Hospital; Helsinki Finland