1. Centro AGB Ultrasonografía, Clínica Sanatorio Alemán, Facultad de MedicinaUniversidad de Concepción Concepción Chile
2. Fetal and Neonatal UltrasonographyDepartment, Hospital Lusíadas Lisbon Portugal
3. Fetal Medicine Unit—Maternal and Child Health and Development Network, Department of Obstetrics and Gynaecology, University Hospital 12 de Octubre, 12 de Octubre Research Institute (imas12)Complutense University of Madrid Madrid Spain