Yuval Yaron1,2, Antoni Borrell3,4. 1. Prenatal Genetic Diagnosis Unit, Genetic Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel. 2. Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. 3. BCNatal, Hospital Clinic, Barcelona, Catalonia, Spain. 4. Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Catalonia, Spain.