1. Fetal Medicine & Surgery UnitIstituto Giannina Gaslini Genoa Italy
2. Unit of Epidemiology and BiostatisticsIstituto Giannina Gaslini Genoa Italy
3. Department of Ultrasonic Medicine, Fetal Medical CenterFirst Affiliated Hospital of Sun Yat‐sen University Guangzhou China
4. Department of Pediatric Cardiology and Cardiac SurgeryIstituto Giannina Gaslini Genoa Italy