Batra, R., S. Harish C, S. Gupta, and A. Garg. “Effect of COVID 19 Vaccination on the CT Severity Score for SARS CoV2 Pneumonia- an Experience from the Initial Wave”. Brazilian Journal of Radiation Sciences, vol. 11, no. 3, July 2023, pp. 1-11, doi:10.15392/2319-0612.2023.2279.