Al-noori, A. S. .; Salih, A. M. .; Merza, M. A. . 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. Cell Mol Biol (Noisy-le-grand) 2025, 71, 100-108.