1 Fetal Medicine Unit, Department of Obstetrics and Gynecology, Hospital Italiano de Buenos Aires, Instituto Universitario Hospital Italiano, JD Peron 4190 (C1199ACI), Buenos Aires, Argentina. Electronic address: cesar.meller@hospitalitaliano.org.ar.
2 Fetal Medicine Unit, Department of Obstetrics and Gynecology, Hospital Italiano de Buenos Aires, Instituto Universitario Hospital Italiano, JD Peron 4190 (C1199ACI), Buenos Aires, Argentina.