Sobia, Farah, et al. “Impact of COVID-19 Infection on Outcome of Cardiac Surgery Patients in Tertiary Cardiac Care Hospital”. Pakistan Armed Forces Medical Journal, vol. 73, no. SUPPL-3, Dec. 2023, pp. S556-561, https://doi.org/10.51253/pafmj.v73iSUPPL-3.10536.