[1] Sapienza Univ Rome, Dept Maternal & Child Hlth & Urol Sci, Rome, Italy
[2] Univ G dAnnunzio, Ctr Fetal Care & High Risk Pregnancy, Dept Obstet & Gynecol, Chieti, Italy
[3] Univ Roma Tor Vergata, Fdn Policlin Tor Vergata, Dept Obstet & Gynecol, Rome, Italy
[4] IRCCS Azienda Osped Univ Bologna, Obstet Unit, Bologna, Italy
[5] Univ London, St Georges Univ Hosp NHS Fdn Trust, Fetal Med Unit, London, England
[6] St Georges Univ London, Mol & Clin Sci Res Inst, Vasc Biol Res Ctr, London, England
[7] Univ Liverpool, Liverpool Womens Hosp, Fetal Med Unit, Liverpool, England
[8] Univ Oxford, Nuffield Dept Womens & Reprod Hlth, Oxford, England
[9] Univ Oxford, Oxford Maternal & Perinatal Hlth Inst, Green Templeton Coll, Oxford, England