PERIOPERATIVE ANALGESIC EFFICACY OF THE ERECTOR SPINAE PLANE BLOCK WITHIN A MULTIMODAL ANESTHESIA PROTOCOL FOR OPEN THORACOLUMBAR SPINAL FIXATION SURGERY. (2026). Macedonian Journal of Anaesthesia, 10(2), 25-36. https://doi.org/10.67214/y2vqzw55 (Original work published 2026)