1. Cardiac screening examination of the fetus: guidelines for performing the ‘basic’ and ‘extended basic’ cardiac scan;Ultrasound Obstet Gynecol,2006
2. Antenatal care: routine care for the healthy pregnant woman http://www.nice.org.uk/CG062
3. 18 + 0 to 20 + 6 weeks fetal anomaly scan - National standards and guidance for England 2010 http://fetalanomaly.screening.nhs.uk/standardsandpolicies2010
4. Ultrasound Screening: Supplement to Ultrasound Screening for Fetal Abnormalities http://www.rcog.org.uk/print/womens-health/clinical-guidance/ultrasound-screeningRCOG2011
5. Israel Society of Ultrasound in Obstetrics and Gynecology http://www.isuog.org.il/main/siteNew/?page=&action=sidLink&stld=301