Alfrehat, E. N., E. M. Alnsour, E. M. Al Hmeisat, and F. Alsoleihat. “Prevalence and Correlation of Vitamin B12 and Vitamin D Levels Among Jordanian Patients”. European Scientific Journal, ESJ, Vol. 36, Dec. 2024, p. 364, https://eujournal.org/index.php/esj/article/view/18885.