1. Department of Pediatric Cardiosurgery, Center of Fetal Cardiology, Policlinico San Donato IRCCS, Via Morandi 30, San Donato Milanese, 20097 Milan, Italy
2. Clinical Genetic Unit, Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
3. Obstetrics and Gynecology Unit, Ospedale San Giuseppe, 20123 Milan, Italy
4. Neonatal Intensive Care Unit, Ospedale B. Romeo, 98066 Patti, Messina, Italy
5. Clinical Epidemiology and Biometry Unit, Policlinico San Donato IRCCS, 20097 Milan, Italy