Werawatakul, Yuthapong, and Chuanchom Sakondhavat. “Use of Ultrasound in Obstetrics and Gynecology”. Srinagarind Medical Journal 2, no. 4 (November 11, 2013): 257–264. accessed September 18, 2026. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13427.