1. Department of Fetal Medicine and Obstetrics Leiden University Medical Center Leiden The Netherlands
2. Division of Pediatric Cardiology Department of Pediatrics University of California San Francisco California USA
3. Department of Pediatric Cardiology and Congenital Heart Disease German Heart Center Munich Munich Germany
4. Children's Heart Center Prague University Hospital Motol Prague Czech Republic
5. Department of Child's Cardiology Zagreb University Hospital Zagreb Croatia
6. Department of Perinatal Cardiology and Congenital Anomalies Centre of Postgraduate Medical Education Warsaw Poland
7. Department of Cardiology The Children's Memorial Health Institute Warsaw Poland
8. Department of Cardiology Ukrainian Children's Cardiac Centre Kyiv Ukraine
9. Children's Heart Centre Stockholm‐Uppsala Karolinska University Hospital Stockholm Sweden
10. Division of Cardiology Labatt Family Heart Centre The Hospital for Sick Children Toronto Ontario Canada
11. Department of Obstetrics and Gynecology Eastern Virginia Medical School Norfolk Virginia USA