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First-Trimester Screening for Trisomy 21 with Adjustment for Biochemical Results of Previous Pregnancies.
Wright D, Syngelaki A, Birdir C, Bedei I, Nicolaides KH.
Fetal Diagn Ther 2011;30:194-202. -
A reassessment of biochemical marker distributions in trisomy 21-affected and unaffected twin pregnancies in the first trimester.
Madsen HN, Ball S, Wright D, Tørring N, Petersen OB, Nicolaides KH, Spencer K.
Ultrasound Obstet Gynecol 2011;37:38-47.