National Council of Research, Institute of Clinical Physiology, c/o Campus Universitario Ecotekne;
Department of Ob-stetrics and Gynecology, University of Perugia, Santa Maria della Misericordia University Hospital;
Obstetrics and Gynecology Department, "Vito Fazzi" Hospital, Piazza Filippo Muratore;
Prenatal; diagnosis; Prenatal; sonography; Chromosome; abnormalities; nuchal; translucency; Fetal; echocardiography; Skeletal; dysplasia;