Werawatakul Y, Sakondhavat C. Use of Ultrasound in Obstetrics and Gynecology. SRIMEDJ [internet]. 2013 Nov. 11 [cited 2026 Sep. 18];2(4):257-64. available from: https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13427