Jetsawangsri, Thavat, Nopadol Saropala, Apichart Chittachareon, Rasig Rangsiprakarn, and Yongyoth Herabutya. “A Preliminary Report on Mid-trimester Routine Ultrasonographic Screening in Ramathibodi Hospital”. Thai Journal of Obstetrics and Gynaecology 8, no. 4 (December 1, 1996): 301–305. accessed September 28, 2026. https://he02.tci-thaijo.org/index.php/tjog/article/view/92544.