Comparative study between dexmedetomidine and fentanyl as adjuvants to bupivacaine for postoperative epidural analgesia in abdominal surgeries: A randomized controlled trial by Mohammed Waheed Mahmoud Emam, Bahaa El-Din Ewees Hassan, Hadeel Magdy Abd El-Hamid, Ibrahim Alshaht Ibrahim, Mohamed Abd Elmawla Saleh

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