Al-noori, A. S. ., A. M. . Salih, and M. A. . Merza. “Vaccination and Vitamin D in Relation to Disease Severity and Mortality in Patients With COVID-19 Disease: A Follow-up Study: COVID-19 Status, Its Vaccination, and Vitamin D”. Cellular and Molecular Biology, vol. 71, no. 11, Dec. 2025, pp. 100-8, doi:10.14715/cmb/2025.71.11.13.