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Fetal fraction estimate in twin pregnancies using directed cell-free DNA analysis.
Struble CA, Syngelaki A, Oliphant A, Song K, Nicolaides KH.
Fetal Diagn Ther 2014;35:199-203. pdf -
Cell-free DNA analysis for trisomy risk assessment in first-trimester twin pregnancies.
Gil MM, Quezada MS, Bregant B, Syngelaki A, Nicolaides KH.
Fetal Diagn Ther 2014;35:204-11. pdf