Prapaspongsa, Tawan, and Jittima Manonai. 2017. “Transvaginal Sonographic Assessment of Postvoid Residual Urine Volumes in Women With Pelvic Floor Dysfunction”. Ramathibodi Medical Journal 40 (2):34-41. https://he02.tci-thaijo.org/index.php/ramajournal/article/view/93931.