Forehead and facial heights in Down syndrome and normal fetuses in the midtrimester of pregnancy
I. H. Kalelioglu, S. G. Erzincan, R. Has, A. Yuksel
Clinical and Experimental Obstetrics & Gynecology . 2020, (2): 220 -227 .  DOI: 10.31083/j.ceog.2020.02.5434