Patel, P. ., and K. Chodvadiya. “A Study on Correlation of COVID-19 Vaccination and Hospitalization Among Adults Aged 45 Years and Above: A Hospital Based Case Control Study”. National Journal of Community Medicine, vol. 12, no. 07, July 2021, pp. 211-4, https://njcmindia.com/index.php/file/article/view/368.