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«Prevalence of Vitamin D Deficiency and Insufficiency Across Trimesters of Pregnancy in Maiduguri, Nigeria: A Cross-Sectional Study», AJBR, bd. 24, nr. 1, s. 53–57, jan. 2021, åpnet: 5. april 2026. [Online]. Tilgjengelig på: https://ojshostng.com/index.php/ajbr/article/view/1689