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PDFPage 425

Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Wald N., Stone R., Cuckle H. S., Grudzinskas J. G., Barkai G., Brambati B., Teisner B., Fuhrmann W. First trimester concentrations of pregnancy associated plasma protein A and placental protein 14 in Down's syndrome. BMJ. 1992 Jul 4;305(6844):28–28. doi: 10.1136/bmj.305.6844.28. [DOI] [PMC free article] [PubMed] [Google Scholar]
