Haider, A., E. . Shalim, and S. . Afzal. “Risk Factors and Outcome of Acute Kidney Injury in Critical COVID-19 Patients in Karachi, Pakistan: A Single Center, Retrospective Study”. Pakistan Journal of Kidney Diseases, vol. 7, no. 2, June 2023, pp. 3-7, doi:10.53778/pjkd72221.