Comparison of the Effect of Propofol and Midazolam on Cognitive Performance in Elderly Patients Undergoing Spinal Anesthesia: A Double-Blind Clinical Trial - Manouchehrian, Nahid; Davoudi, Maryam; Kimiaei Asadi, Hossein; Daneshkhah, Ali; Moradveisi, Latif; Jiryaee, Nasrin (Archives of Anesthesiology and Critical Care, 2022)