1. Prenatal Diagnosis Center; University of Siena; Le Scotte Hospital; Siena
2. Department of Obstetrics and Gynecology; University of Magna Graecia; Catanzaro; Italy
3. P. Palagi Prenatal Diagnosis Unit; Florence
4. Preconceptional and Prenatal Physiopathology; Galliera Hospital
5. Neonatology Unit Galliera Hospital; Genova