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Title:          Clinical application of a contingent screening strategy for trisomies with cell-free DNA: a pilot study
Subject:        BMC Pregnancy and Childbirth, 2019, doi:10.1186/s12884-019-2434-0
Keywords:       Cell-free DNA,Contingent screening,Fetal trisomy,Prenatal screening
Author:         María Ángeles Sánchez-Durán
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