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Fazal Wadood, Muhammad Naeem, Hafiz Imran Ul Haq, Robina Bangash, Amber Amer, Varda Balouch. A Randomized Controlled Trial on the Effectiveness of Tramadol As an Adjunct to Bupivacaine for Caudal Analgesia in Children. Pakistan Journal of Medical & Health Sciences 2022, 16, 1427.