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Muhammad Javed Khan, Attique Ur Rehman Orakzai, Faiza Aslam, Hamid Mehmood, Pavan Kumar, Nazneen Iqbal. A Randomized Controlled Trial on the Effectiveness of Intrathecal Tramadol Versus Buprenorphine As Adjuvants to Hyperbaric Bupivacaine in Infraumbilical Surgeries. Pakistan Journal of Medical & Health Sciences 2023, 17, 323.