„Prevalence of Vitamin D Deficiency and Insufficiency Across Trimesters of Pregnancy in Maiduguri, Nigeria: A Cross-Sectional Study” (2021) African Journal of Biomedical Research, 24(1), pp. 53–57. Disponibil la: https://ojshostng.com/index.php/ajbr/article/view/1689 (Data accesării: 26 iunie 2026).