Karlovich, N., and T. Mokhort. “Fibroblast Growth Factor 23 and Klotho Protein: Assessment of the Role in the Development of Secondary Hyperparathyroidism in Patients With Various Stages of Chronic Kidney Disease”. INTERNATIONAL JOURNAL OF ENDOCRINOLOGY (Ukraine), vol. 17, no. 5, Oct. 2021, pp. 385-92, doi:10.22141/2224-0721.17.5.2021.241516.