Ćirković, Milan, Ksenija Božić, Nataša Petronijević, and Tatjana Nikolić. 2021. “Correlation Between Suboptimal Vitamin D Concentration and Secondary Hyperparathyroidism in Women With Low-Energy Fractures”. Vojnosanitetski Pregled 78 (2). https://doi.org/10.2298/VSP190208054C.