1. Fetal Medicine Unit, Department for Women and Children Health Azienda Ospedaliero Universitaria Careggi Florence Italy
2. Prenatal Diagnosis Center, Azienda USL Toscana Centro Piero Palagi Hospital Florence Italy
3. Maternal‐Fetal Medicine Unit Azienda Ospedaliera Universitaria Pisana Pisa Italy
4. Azienda Ospedaliera Grosseto Grosseto Italy