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Shetabi, H.; Peyman , A. .; Piudeh, F. Comparing the Effectiveness and Safety of Giving Fentanyl or Ketamine Intranasally during Phacoemulsification Surgery: Intranasal Fentanyl VS Intranasal Ketamine in Phacoemulsification Cataract Surgery: Intranasal Fentanyl VS Intranasal Ketamine in Phacoemulsification Cataract Surgery. Galen Med J 2023, 12, e2921.