anbu ananthan, velmurugan, veerakumar AM, and Parameshwari P. “COVID-19: Filling the Gaps in the Natural History of the Disease for Controlling the Pandemic”. National Journal of Research in Community Medicine 9, no. 2 (June 20, 2020): 61–66. Accessed July 25, 2026. https://www.journal.njrcm.com/index.php/njrcm/article/view/131.