1. Fetal Medicine and Surgery Unit IRCCS Istituto Giannina Gaslini Genoa Italy
2. Epidemiology and Biostatistics Unit IRCCS Istituto Giannina Gaslini Genoa Italy
3. Department of Obstetrics and Gynecology University Federico II Naples Italy
4. Fetopathology Unit IRCCS Istituto Giannina Gaslini Genoa Italy