Mahmood, S., Zafar, N., Anjum, N., Saldera, K. A., Samo, U. B. K., & Shahid, T. (2023). Relationship between Vitamin D Insufficient, Vitamin D Deficient Pakistani population and COVID-19. International Journal of Health Sciences, 7(S1), 284–295. https://doi.org/10.53730/ijhs.v7nS1.14191