title: Reply.
authors.affiliation: Fetal Medicine Unit, Division of Developmental Sciences, St George's University of London, London, UK.
authors.forename: F
authors.initials: F
authors.lastname: D'Antonio
authors.affiliation: Fetal Medicine Unit, Division of Developmental Sciences, St George's University of London, London, UK.
authors.forename: A
authors.initials: A
authors.lastname: Khalil
authors.affiliation: Hopital d'Enfants Armand-Trousseau - Service de Radiologie, Cedex, Paris, France.
authors.forename: C
authors.initials: C
authors.lastname: Garel
authors.affiliation: Department of Obstetrics and Gynecology, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Pilu
authors.affiliation: Department of Obstetrics and Gynecology, Universita di Roma, Tor Vergata, Rome, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Rizzo
authors.affiliation: Fetal Neurology Clinic and Paediatric Neurology Unit, Wolfson Medical Center, Holon, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.
authors.forename: T
authors.initials: T
authors.lastname: Lerman-Sagie
authors.affiliation: Fetal Medicine Unit, Division of Developmental Sciences, St George's University of London, London, UK.
authors.forename: A
authors.initials: A
authors.lastname: Bhide
authors.affiliation: Fetal Medicine Unit, Division of Developmental Sciences, St George's University of London, London, UK.
authors.forename: B
authors.initials: B
authors.lastname: Thilaganathan
authors.affiliation: Department of Medicine and Aging Sciences, University of Chieti-Pescara, and EMISAC, CeSI Biotech, Chieti, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Manzoli
authors.affiliation: Fetal Medicine Unit, Division of Developmental Sciences, St George's University of London, London, UK.
authors.forename: A T
authors.initials: AT
authors.lastname: Papageorghiou