References
- Boyd P.A., Chamberlain P. and Hicks N.R. (1998) Six-year experience of prenatal diagnosis in an unselected population in Oxford, UK. Lancet, 352, 1577–1581.
- RCOG Working Party (2000) Routine Ultrasound Screening in Pregnancy: Standards and Training. London, RCOG Press.
- Smith N.C. and Hau C. (1999) A six year study of antenatal detection of fetal abnormality in six Scottish health boards. British Journal of Obstetrics and Gynaecology, 106, 206–212.