Comparative efficacy of intraperitoneal bupivacaine, bupivacaine with tramadol, and bupivacaine with clonidine for postoperative pain management in laparoscopic cholecystectomy: A randomized controlled trial - Harish Kumar; Ruchi Tandon; Sandeep Kumar; Shikha Jain; Ankita . (Indian Journal of Clinical Anaesthesia, 2026)