Naznin, C. L. ., S. . Giti, A. . Ahmed Khan, Y. . Akter, M. . Parvin, and S. . Sultana. “Evaluation of Serum Ferritin in Hospitalized Patients With COVID-19 As A Potential Biomarker for Assessing COVID-19 Severity”. Journal of Bangladesh College of Physicians and Surgeons, vol. 39, no. 4, Sept. 2021, pp. 220-4, doi:10.3329/jbcps.v39i4.55942.