„Prevalence of Vitamin D Deficiency and Insufficiency Across Trimesters of Pregnancy in Maiduguri, Nigeria: A Cross-Sectional Study”, AJBR, vol. 24, nr. 1, pp. 53–57, ian. 2021, Data accesării: 25 aprilie 2026. [Online]. Disponibil la: https://ojshostng.com/index.php/ajbr/article/view/1689