Subramanya, P. B., N. J. Khan, M. Mahendra, I. Khan, and N. Ravikumar. “Correlation of CALL Score With Disease Progression in COVID-19 Patients”. International Journal of Research in Medical Sciences, vol. 10, no. 5, Apr. 2022, pp. 1035-40, doi:10.18203/2320-6012.ijrms20221013.