G Paviotti1, S Demarini1, G Verardi2, A De Cunto1, R Davanzo1. 1. Division of Neonatology, Institute for Maternal and Child Health IRCCS 'Burlo Garofolo', Trieste, Italy. 2. Division of Obstetrics and Gynecology, Institute for Maternal and Child Health IRCCS 'Burlo Garofolo', Trieste, Italy.