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Fentanyl and Clonidine with local Anaesthetics in Supraclavicular Brachial Plexus Block for Post operative Analgesia : A Comparative study. AJPHS [Internet]. 2016 Sep. 30 [cited 2025 Nov. 20];6(3):1514-21. Available from: https://ajphs.com/index.php/ajphs/article/view/387