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Dr. Jishnu.V,Dr Vinod Kumar Yadav,Dr Leena Goel,Dr Anshul Gaur. A Comparative Study of Local Anaesthetic Agent Levobupivacaine and Ropivacaine in Ultrasound Guided Erector Spinae Plane Block in Patients Undergoing Laparoscopic Cholecystectomy. IJPRT 2026, 16, 351-364.