H. Shetabi, A. . Peyman, and F. Piudeh, “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, vol. 12, p. e2921, Dec. 2023.