Fazal Wadood, Madiha Zafar, Dur I Shahwar, Umar Iqbal, Shahid Adalat Chaudhry, Varda Balouch. A Comparative Study on the Efficacy of Tramadol and Fentanyl Added To Low Dose Bupivacaine in Subarachnoid Block for Caesarean Section. Pakistan Journal of Medical & Health Sciences [Internet]. 2022 Sep. 21 [cited 2024 Jul. 17];16(06):1080. Available from: https://pjmhsonline.com/index.php/pjmhs/article/view/2401