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First trimester maternal serum placenta growth factor (PlGF)concentrations in pregnancies with fetal trisomy 21 or trisomy 18.
Spencer K, Liao AW, Ong CY, Geerts L, Nicolaides KH.
Prenat Diagn 2001;21:718-22. -
First-trimester maternal serum levels of placenta growth factor as predictor of preeclampsia and fetal growth restriction.
Ong CY, Liao AW, Cacho AM, Spencer K, Nicolaides KH.
Obstet Gynecol 2001;98:608-11.