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First-trimester maternal serum levels of placenta growth factor as predictor of preeclampsia and fetal growth restriction.
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Obstet Gynecol 2001;98:608-11. -
Serum ferritin and cobalamin in red blood cell isoimmunisation.
Abbas A, Nicolaides KH.
Fetal Diagn Ther 1995;10:297-300.