Srivongpanich, Surapol. “The Feasibility of Extern Training on Ultrasound Fetometry”. Thai Journal of Obstetrics and Gynaecology 21, no. 1 (April 1, 2013): 23–31. accessed September 26, 2026. https://he02.tci-thaijo.org/index.php/tjog/article/view/7586.