1. World Health Organization (2020). Pneumonia of Unknown Cause – China. Published online January 5, 2020.
2. World Health Organization (2020). Statement on the Second Meeting of the International Health Regulations (2005) Emergency Committee Regarding the Outbreak of Novel Coronavirus (2019-nCoV).
3. World Health Organization (2020). WHO Director-General's Opening Remarks at the Media Briefing on COVID-19 - 11 March 2020. Published online March 11, 2020.
4. WHO Coronavirus Disease (COVID-19) Dashboard,2020
5. Assessing the age specificity of infection fatality rates for COVID-19: systematic review, meta-analysis, and public policy implications;Levin;Eur. J. Epidemiol.,2020