Sathian, Brijesh, Mohammad Asim, Indrajit Banerjee, Bedanta Roy, Ana Beatriz Pizarro, Maraeh Angela Mancha, Edwin R. van Teijlingen, et al. “Development and Implementation of a Potential Coronavirus Disease 2019 (COVID-19) Vaccine: A Systematic Review and Meta-Analysis of Vaccine Clinical Trials”. Nepal Journal of Epidemiology 11, no. 1 (March 31, 2021): 959–982. Accessed January 23, 2025. https://www.nepjol.info/index.php/NJE/article/view/36163.