Mohamed, J. B., and S. S. Haji. “The Prevalence of Vitamin D Deficiency Among Patients With Schizophrenia in Duhok City”. Science Journal of University of Zakho, vol. 4, no. 1, June 2016, pp. 32-36, https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/302.