”Prevalence of Vitamin D Deficiency and Insufficiency Across Trimesters of Pregnancy in Maiduguri, Nigeria: A Cross-Sectional Study”, AJBR, vol. 24, nr 1, s. 53–57, jan. 2021, åtkomstdatum: 25 april 2026. [Online]. Tillgänglig vid: https://ojshostng.com/index.php/ajbr/article/view/1689