by Boyd, P.A. et al.
National Perinatal Epidemiology Unit, University of Oxford, Oxford, UK
National Perinatal Epidemiology Unit, University of Oxford, Oxford, UK
Survey of prenatal screening policies in Europe for structural malformations and chromosome anomalies, and their impact on detection and termination rates for neural tube defects and Down's syndrome.
BJOG. 2008; 6:689-96