Songborassamee N, Chaiaroondeekul W, Kampitak W, Songthamwat B, Songborassamee N. The Optimal Angles and Point of Needle Insertion in Paramedian Spinal Anesthesia: an Ultrasonographic Study. Thai J Anesthesiol [internet]. 2022 Mar. 30 [cited 2026 Sep. 28];48(2):137-46. available from: https://he02.tci-thaijo.org/index.php/anesthai/article/view/257008