1 Department of Obstetrics and Gynecology, University of Chieti, Chieti, Italy.
2 Fetal Medicine Unit, Division of Developmental Sciences, St. George's University of London, London, United Kingdom.
3 Womeńs Health and Perinatology Research Group, Department of Clinical Medicine, UiT-The Arctic University of Norway, Tromsø, Norway; Department of Obstetrics and Gynaecology, University Hospital of Northern Norway, Tromsø, Norway. Electronic address: francesco.dantonio@uit.no.