1. Department of Mother, Child and Neonate Fondazione IRCCS Ca' Granda Ospedale Policlinico di Milano Milan Italy
2. Department of Clinical and Community Sciences University of Milan Milan Italy
3. Unit of Fetal Medicine and Prenatal Diagnosis Institute for Maternal and Child Health IRCCS “Burlo Garofolo” Trieste Italy
4. Department of Medicine, Surgery and Health Sciences University of Trieste Trieste Italy