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Detection of trisomy 21 by quantitative mass spectrometric analysis of single-nucleotide polymorphisms.
Tsui NB, Chiu RW, Ding C, El-Sheikhah A, Leung TN, Lau TK, Nicolaides KH, Lo YM.
Clin Chem 2005;51:2358-62. -
Comparison of protocols for extracting circulating DNA and RNA from maternal plasma.
Chiu RW, Lui WB, El-Sheikhah A, Chan AT, Lau TK, Nicolaides KH, Lo YM.
Clin Chem 2005;51:2209-10.