1. Department of Woman, Mother and Neonate, Buzzi Hospital; Biomedical and Clinical Sciences School of Medicine; University of Milan Milan Italy
2. Unit of Prenatal Diagnosis; IRCCS Burlo Garofolo; Trieste Italy
3. Laboratory ‘GA Maccacaro’ Department of Clinical Sciences and Community Health; University of Milan Milan Italy
4. Obstetrics and Gynecology Unit; San Raffaele Scientific Institute; Vita-Salute University Milan Italy
5. Ob/Gyn Unit, Department for Health of Mothers and Children; Padua City Hospital; Padua Italy
6. Department of Obstetrics and Gynecology; University of Milano-Bicocca; Monza Italy
7. High Risk Pregnancy Unit; University Hospital of Careggi; Florence Italy
8. Department of Surgical Sciences; Sant'Anna Hospital; University of Turin Turin Italy