Comparative Study of Dexmedetomidine and Fentanyl as an Adjuvant to Epidural Bupivacaine for Post-operative Pain Relief in Hepato-biliary Pancreatic Surgery. (2019). Anwer Khan Modern Medical College Journal, 10(2), 143-149. https://doi.org/10.3329/akmmcj.v10i2.44127