Kadambari, S., Goldacre, R., Morris, E., Goldacre, M. J., & Pollard, A. J. (2022). Indirect effects of the covid-19 pandemic on childhood infection in England: Population based observational study. BMJ, 376, e067519. https://doi.org/10.1136/bmj-2021-067519

CNN, C. M. (n.d.). Previous vaccines and masks may hold down Covid-19, some researchers say. CNN. Retrieved 12 August 2020, from https://www.cnn.com/2020/08/11/health/us-coronavirus-tuesday/index.html