Institution: | 1. Department of Obstetrics and Gynaecology, Hospital General de Granollers, Granollers, Barcelona, Catalonia, Spain;2. Ultrasound Unit, Department of Obstetrics and Gynaecology, Hospital Clinic, University of Barcelona, Barcelona, Catalonia, Spain;3. Prenatal Diagnosis Unit, Hospital Clinic, University of Barcelona, Barcelona, Catalonia, Spain |