1. WHO.Coronavirus Disease (COVID‐19) Pandemic.https://www.who.int/emergencies/diseases/novel-coronavirus-2019. Accessed March 25 2020.
2. WHO.WHO Director‐General's opening remarks at the media briefing on COVID‐19 ‐ 11 March 2020.https://www.who.int/dg/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19---11-march-2020. Accessed March 25 2020.
3. Coronavirus COVID‐19 global cases.https://www.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6. Accessed March 25 2020.
4. A rapid advice guideline for the diagnosis and treatment of 2019 novel coronavirus (2019-nCoV) infected pneumonia (standard version)