Osman, Heba, et al. “Inter-Observer and Intra-Observer Agreement of Bosniak Classification of Cystic Renal Masses: Comparison Between Original Version to Version 2019 and Effect of an Online Support Calculator”. Canadian Urological Association Journal, vol. 15, no. 12, June 2021, pp. 420-2, doi:10.5489/cuaj.7369.