《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), 页 53–57. 载于: https://www.ojshostng.com/index.php/ajbr/article/view/1689 (见于: 21 五月 2026).