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Thati Ajith Kumar, P.Sreedevi, Anjali Rajan, Pramod Parthasarathy. A study of safety and efficacy of analgesia and anaesthesia between intrathecal fentanyl and butorphanol as adjuvants with bupivacaine 0.5% heavy for lower limb orthopedic surgeries. Int. J. Heal. Clin. Res. [Internet]. 2021Nov.21 [cited 2024Dec.26];4(20):45-51. Available from: https://ijhcr.com/index.php/ijhcr/article/view/3175