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Maternal serum resistin at 11 to 13 weeks' gestation in normal and pathological pregnancies.
Nanda S, Poon LC, Muhaisen M, Acosta IC, Nicolaides KH.
Metabolism 2012;61:699-705. -
Second-trimester levels of pregnancy-associated plasma protein-A and free beta-hCG in pregnancies with trisomy 13.
Spencer K, Crossley JA, Aitken DA, Nicolaides KH.
Prenat Diagn 2005;25:358-61.