Awasthi, Swambhavi, Sunil Sharma, Saurav Attri, Sakshi Malik Attri, Rajesh Sharawat, and Gayatri Vishwakarma. “History and Spread of Viruses (COVID-19) and Associated Demographic and Clinical Parameters – A Systematic Review and Meta-Analysis”. Indian Journal of Community Health 33, no. 1 (March 31, 2021): 9–24. Accessed November 21, 2024. http://iapsmupuk.org/journal/index.php/IJCH/article/view/1961.