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A comparison of fentanyl and clonidine as adjuvants to intrathecal levobupivacaine for spinal anaesthesia and postoperative analgesia in patients undergoing for lower limb surgery. Int Jour of Biomed Res [Internet]. 2018 Mar. 3 [cited 2026 Mar. 17];9(2):76-80. Available from: https://www.ssjournals.co.in/index.php/ijbr/article/view/4622