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Shumaila Ashfaq, Faheem Asghar, Aftab Ahmad Channa, Muhammad Saqib, Nisar Ahmad, Shahjehan. A Comparative Study on Caudal Bupivacaine With and Without Tramadol for Analgesia Postoperatively in Paediatric Inguino Scrotal Surgeries. Pakistan Journal of Medical & Health Sciences 2022, 16, 520.