Prapaspongsa, Tawan, and Jittima Manonai. “Transvaginal Sonographic Assessment of Postvoid Residual Urine Volumes in Women with Pelvic Floor Dysfunction”. Research Medical Journal 40, no. 2 (June 30, 2017): 34–41. accessed September 19, 2026. https://he02.tci-thaijo.org/index.php/ramajournal/article/view/93931.