Ali, G.S., Najeeb, M.K., Jubrail, A.M.S. and Selamoğlu, Z. 2019. A Study of Vitamin D and Calcium Level in Beta Thalassemia Major in Duhok Province. Turkish Journal of Agriculture - Food Science and Technology. 7, 11 (Nov. 2019), 1924–1927. DOI:https://doi.org/10.24925/turjaf.v7i11.1924-1927.2893.