Ali, Waqar, et al. “Unmasking of Pre-Existent Hyperglycemia and Its Association With Ventilation in COVID-19 Patients: Experience at a Tertiary Care Hospital”. Pakistan Armed Forces Medical Journal, vol. 73, no. 2, Apr. 2023, pp. 452-55, https://doi.org/10.51253/pafmj.v73i2.8041.