Alfrehat, Eman N., Essra M. Alnsour, Enas M. Al Hmeisat, and Firas Alsoleihat. “Prevalence and Correlation of Vitamin B12 and Vitamin D Levels Among Jordanian Patients”. European Scientific Journal, ESJ 21, no. 6 (February 28, 2025): 109. Accessed April 19, 2025. https://eujournal.org/index.php/esj/article/view/19158.