1. Abramsky L, Rodeck CH (1991) Women's choices for fetal chromosome analysis. Prenat Diagn 11:23–28
2. Annual Report Committee of The Working Party on Prenatal Diagnosis (1992) Annual Report 1989. Working Party on Prenatal Diagnosis of the Dutch Society of Obstetrics and Gynaecology and the Dutch Society of Clinical Genetics, Utrecht
3. Beekhuis JR, Mantingh A, de Wolf BTHM, van Lith JMM, Breed ASPM (1993) Maternal serum screening for fetal neural tube defects and Down's syndrome; first Dutch experience. Ned Tijdschr Geneeskd 137:1303–1307
4. Bogart MH, Jones OW (1991) Invited editorial response: Prenatal screening for fetal Down's syndrome. Prenat Diagn 11:751–765
5. CBS (1974) Maandstatistiek van bevolking en volksgezondheid (in Dutch), vol 22. Staatsuitgeverij, The Hague, pp 165–168