Wataganara, T. ., Talungjit, P., Phithakwatchara, N. ., & Swasdimongkol, S. . (2008). Three Dimensional Sonographic Appearances of Chinese Ring Intrauterine Device:. Siriraj Medical Journal, 60(6), 360–363. Retrieved from https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246512