Copuroglu, Elif, and Gonul Sagiroglu. “Is Regional Anesthesia a Safe Technique for Patients With Severe Ankylosing Spondylitis Undergoing Total Hip Replacement Surgery?”. International Surgery Journal 5, no. 8 (July 24, 2018): 2913–2916. Accessed February 27, 2026. https://www.ijsurgery.com/index.php/isj/article/view/3122.