“Vitamin - D Level and Severity of COVID-19 Among the Admitted Patients in a COVID Dedicated Tertiary Care Hospital - An Prospective Study”. Journal of Bangladesh College of Physicians and Surgeons 40, no. 3 (July 5, 2022): 166–170. Accessed July 7, 2026. https://banglajol.info/index.php/JBCPS/article/view/60302.