Karlovich, N.V., and T.V. Mokhort. 2021. “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) 17 (5):385-92. https://doi.org/10.22141/2224-0721.17.5.2021.241516.