title: Reply.
authors.affiliation: Department of Obstetrics and GynecologyUniversity of ParmaParma, Italy.
authors.forename: Tullio
authors.initials: T
authors.lastname: Ghi
authors.affiliation: Department of Obstetrics and GynecologyUniversity of Milan Buzzi Children's HospitalMilan, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Ferrazzi
authors.affiliation: Department of Obstetrics and GynecologyUniversity of BresciaBrescia, Italy.
authors.forename: Federico
authors.initials: F
authors.lastname: Prefumo
authors.affiliation: Department of Obstetrics and GynecologyUniversity of Rome Tor VergataRome, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Rizzo