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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. -
Maternal thyroid function at gestational weeks 11-13 in twin pregnancies.
Ashoor G, Muto O, Poon LC, Muhaisen M, Nicolaides KH.
Thyroid 2013;23:1165-71.