Suppinyopong, S., M. Surathannon, S. Chawanpaiboon, D. Boriboonhirunsarn, and S. Sangkarat. “Transvaginal Ultrasonographic Measurement of Endometrial Thickness in The Detection of Endometrial Abnormalities”. Siriraj Medical Journal, vol. 53, no. 5, Aug. 2020, pp. 277-83, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/244535.