Karki, S, KS Joshi, SR Tamrakar, S Regmi, and K Khanal. 2015. “Nuchal Translucency in Normal Fetus and Its Variation With Increasing Crown Rump Length (Crl) and Gestational Age”. Kathmandu University Medical Journal 11 (4):282-86. https://doi.org/10.3126/kumj.v11i4.12522.