Mahmood Hussein, K. ., A. . Mahmood Hussein, and A. . Khalaf Salim. “Relation of Backache and Level of Vitamin D in a Sample of Patients That Attend Azadi Teaching Hospital in Kirkuk City”. Journal of Wildlife and Biodiversity, vol. 7, no. Special Issue, Nov. 2023, pp. 252-61, doi:10.5281/zenodo.10212229.