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Abdul Sattar Shamsuddin, Maqsood Ahmed Siddiqui, Anum Zeb, Abid Rafiq Chaudhry, Tayyab Ali, Mamoona Shaikh. Comparison of Caudal Bupivacaine and Bupivacaine-Tramadol Combination for Postoperative Analgesia in Children Undergoing Lower Abdominal Surgeries. Pakistan Journal of Medical & Health Sciences 2022, 16, 1129.