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URL: http://scholar.google.com/scholar_lookup?title=Antenatally+detectable+markers+for+the+diagnosis+of+autosomally+trisomic+fetuses+in+at-risk+pregnancies.&year=1997&author=Salihu&journal=Am.+J.+Perinatol.&volume=14&pages=257-261&pmid=9259939