Does timing matter? Comparing pre- and postoperative erector spinae plane blocks in lumbar spine surgery. - Sarı S; Gülaştı F; Yay MÖ; Umutlu Y; Kyenshilik D; Haney G; Turan A (European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2026)