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EFFECT OF ULTRASOUND-GUIDED ERECTOR SPINAE PLANE BLOCK ON POSTOPERATIVE PAIN IN PATIENTS UNDERGOING OPEN NEPHRECTOMY AND PYELOPLASTY: A SINGLE-CENTER OBSERVATIONAL STUDY. Grn Int J Apl Med Sci 2026, 4 (2), 65-70. https://doi.org/10.62046/gijams.2026.v04i02.005.