Perioperative use of ketamine infusion versus dexmedetomidine infusion for analgesia in obese patients undergoing bariatric surgery: a double-blinded three-armed randomized control... by Belal Nabil Mahfouz Khalil, Maha Sadek Hussein Elderh, Mohamed Abdel Rasoul Khaja, Ahmed Nagah El-Shaer, Bahaa El-Din Ewees Hassan Ali, Mohamed Osman Awad Taeimah

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