Phithakwatchara, N., & Phatihattakorn, C. (2020). Specificity of Hypocoiled Umbilical Cord in Prediction of Fetal Trisomy 21 in the Second Trimester. Siriraj Medical Journal, 62(4), 170–172. retrieved from https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/243895