Ranjan, Alok, et al. “Epidemiological and Clinical Factors Associated With Mortality of Confirmed Covid-19 Cases Admitted and Treated in a Tertiary Care Hospital of Patna, Bihar”. Indian Journal of Community Health, vol. 33, no. 1, Mar. 2021, pp. 30-40, doi:10.47203/IJCH.2021.v33i01.005.