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A case-control study of maternal periconceptual and pregnancy recreational drug use and fetal malformation using hair analysis.
David AL, Holloway A, Thomasson L, Syngelaki A, Nicolaides K, Patel RR, Sommerlad B, Wilson A, Martin W, Chitty LS.
PLoS One 2014;9:e111038. pdf -
Clinical significance of first-trimester chorionic bumps: a matched case-control study.
Sana Y, Appiah A, Davison A, Nicolaides KH, Johns J, Ross JA.
Ultrasound Obstet Gynecol 2013;42:585-9.