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Ghulam Murtaza Shaikh, Muhammad Muazzam Butt, Mohsin Riaz Askri, Eram Shahzadi, Shumyala Maqbool, Syed Imtiaz Ali Zaidi. Analgesia After Lower Abdominal Surgery in Children Treated With Caudal Bupivacaine Versus a Bupivacaine-Tramadol Combination. Pakistan Journal of Medical & Health Sciences 2023, 17, 137.