Koç, A. S., and H. E. Sümbül. “Relationship Between Renal Resistive Index and Increased Renal Cortical Stiffness in Patients With Preserved Renal Function”. European Journal of Therapeutics, vol. 24, no. 4, Apr. 2023, pp. 255-61, doi:10.5152/EurJTher.2018.817.