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Study on Efficacy of Nalbuphine Hydrochloride as Pre-Emptive Analgesic – Comparison With Diclofenac Sodium after Open Cholecystectomy. j Bangladesh Soc Anaesthesiologists [Internet]. 2009 Dec. 16 [cited 2026 Jul. 20];20(2):39-44. Available from: https://www.banglajol.info/index.php/JBSA/article/view/3989