Ruangchainikom W, Sarapak S. Ultrasonographic Fetal Ear Measurement in Predicting Fetal Chromosome Abnormality. Thai J Obstet Gynaecol [internet]. 2001 Jul. 1 [cited 2026 Sep. 28];13(3):147-50. available from: https://he02.tci-thaijo.org/index.php/tjog/article/view/256529