Increased risk after noninvasive prenatal screening on cell‐free DNA circulating in maternal blood: does a new indication for invasive prenatal diagnosis require new criteria for confirmatory cytogenetic analysis?. (March 2015) - Grati, Francesca Romana; Malvestiti, Francesca; Grimi, Beatrice; Liuti, Rosaria; Agrati, Cristina; Gaetani, Elisa; Milani, Silvia; Martinoni, Lorenza; Zanatta, Valentina; Gallazzi, Gloria; Maggi, Federico; Simoni, Giuseppe