1. WorldHealthOrganization, Global Health Estimates 2016: Disease burden by Cause, Age, Sex, by Country and by Region, 2000-2016. Geneva, 2018.
2. WorldHealthOrganization, Global Health Estimates 2016: Deaths by Cause, Age, Sex, by Country and by Region, 2000-2016. Geneva, 2018.
3. Epidemiology of lower respiratory tract infections in adults;Feldman;Expert. Rev. Respir. Med.,2019
4. WorldHealthOrganization, WHO Coronavirus Disease (COVID-19) Dashboard, 2021 [Accessed on April 8, 2021]; Available from: covid19.who.int.
5. Community-acquired pneumonia;Prina;Lancet,2015