1. Center of Fetal Cardiology, IRCCS Policlinico San Donato, Milan, Italy;
2. Department of Pediatric Cardiac Surgery, IRCCS Policlinico San Donato, Milan, Italy;
3. Department of Obstetrics-Gynecology, Vita Salute University, Milan, Italy;
4. Department of Obstetrics-Gynecology, Ospedali Riuniti, Bergamo, Italy