N. N. Eremenko, E. V. Shikh, and S. Y. Serebrova, “The dynamics of the parathyroid hormone level for the comparative evaluation of calcium absorption from the gastrointestinal tract”, Патогенез, vol. 14, no. 4, pp. 69–73, Jul. 2016, Accessed: Nov. 05, 2026. [Online]. Available: https://pathogenesis.pro/index.php/pathogenesis/article/view/100