Gmitrzuk, J., Malinka, Z., Wiśniewska, K., Jachymek, A., Opatowska, M., Jakubiec, J., Kucharski, T. and Piotrowska, M. 2024. Vitamin D Deficiency. The place of calcifediol in the treatment of vitamin D deficiency - literature review. Quality in Sport. 15, (Jul. 2024), 52009. DOI:https://doi.org/10.12775/QS.2024.15.52009.