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The maternal insulin-like growth factor (IGF) and IGF binding protein response to trisomic pregnancy during the first trimester: a possible diagnostic tool for trisomy 18 pregnancies.
Miell JP, Langford KS, Jones JS, Noble P, Westwood m, White A, Nicolaides KH.
J Clin Endocrinol Metab 1997;82:287-92.