Uatrongjit, Nongyao. “Pain Control during Endometrial Sampling: A three-arm randomized controlled trial comparing lidocaine gel, spray and placebo”. Thai Journal of Obstetrics and Gynaecology (September 3, 2026). accessed September 24, 2026. https://he02.tci-thaijo.org/index.php/tjog/article/view/282207.