Thongphut, Amporn. “Factors Associated with Hypotension in Patients Aged ≥ 80 Years Old with Hip Fracture Surgery Under Spinal Anesthesia at Hatyai Hospital”. Thai Journal of Anesthesiology 52, no. 1 (January 27, 2026): 19–28. accessed September 20, 2026. https://he02.tci-thaijo.org/index.php/anesthai/article/view/280117.