1 Department and Clinic of Internal Diseases, Diabetology, and Nephrology, Metabolic Bone Diseases Unit, Faculty of Medical Sciences in Zabrze, Medical University of Silesia in Katowice, 3-Maja 13/15 street, 41-800, Zabrze, Poland. wpluskiewicz@sum.edu.pl.
2 The Faculty of Medicine and Health Sciences, University of Zielona Góra, Zielona Góra, Poland.