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Study of effect of fentanyl and tramadol added to low dose bupivacaine in subarachnoid block for caesarean section – a comparative study. j Bangladesh Soc Anaesthesiologists [Internet]. 2014 Aug. 3 [cited 2026 Jul. 20];25(2):41-7. Available from: https://www.banglajol.info/index.php/JBSA/article/view/60983