Holgado E, Holgado B, Liddle S, Ballard T, Levett L: A novel method for extracting DNA from chorionic villus samples for use in CVS-PCR, which ensures complete villus dissociation Prenat Diagn. 2009 Feb;29(2):113-9.

Waters JJ, Walsh S. Levett LJ, Liddle S, Akinfenwa Y: Complete discrepancy between abnormal fetal karyotypes predicted by QF-PCR rapid testing and karyotyped cultured cells in a first-trimester CVS. Prenat Diagn. 2006 Oct;26(10):892-7

Zimmermann B, Levett L, Holzgreve W, Hahn S: Use of real-time polymerase chain reaction for the detection of fetal aneuploidies. Methods Mol Biol. 2006;336:83-100.

Levett LJ, Liddle S, Meredith R: A large-scale evaluation of Amnio-PCR for the rapid prenatal diagnosis of fetal trisomy. Ultrasound Obstet Gynecol, 2001 17 115-118.

Black D, Bradley TP, Liddle S, Levett LJ: Effects of Blood Contamination in amniotic fluid for Amnio-PCR testing (QF-PCR). BSHG 2006: JMG Sept 2006 Supplement No 1 S67 (poster)