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Farhan Ali, Abdul Bary, Hamid Raza Laghari, Muhammad Zafar, Muhammad Akram, Sirajuddin. Comparison of Intraperitoneal Instillation of Bupivacaine Versus Tramadol for Post-Operative Pain in Patients Undergoing Laparoscopic Cholecystectomy. Pakistan Journal of Medical & Health Sciences 2023, 17, 171.