Marsis, I. O. “Down Syndrome Screening Using Nuchal Translucency Thickness and Nasal Bone Eximination of Fetus at Maternal Age >= 35 Yearss.”. Majalah Kedokteran UKI, Vol. 25, no. 1, Mar. 2021, pp. 1-6, doi:10.33541/mkvol34iss2pp60.