Parveen, R., Mishra, P., Luthra, R., Bajpai, R., & Agarwal, N. (2023). Association of Metformin with Mortality in COVID-19 Patients: A Systematic Review and Meta-Analysis. Annals of the National Academy of Medical Sciences (India), 59(01), 013-020. https://doi.org/10.1055/s-0042-1760353