1. Pneumonia of unknown cause − China https://www.who.int/ emergencies/disease-outbreak-news/item/2020-DON229 (accessed 2022-03-22).
2. ProMED: International Society for Infectious Diseases. 30 Dec 2019. https://promedmail.org/promed-post/?id=6864153%20#COVID19 (accessed 2022-03-22).
3. World Health Organization. WHO Director-General's statement on IHR Emergency Committee on Novel Coronavirus (2019-nCoV). January 30, 2020. https://www.who.int/dg/speeches/detail/who-director-general-s-statement-on-ihr-emergency-committee-on-novel-coronavirus-(2019-ncov) (accessed 2022-03-20).
4. WHO Director-General’s opening remarks at the media briefing on COVID-19-11 March 2020 https://www.who.int/director-general/speeches/detail/who-director-general-s-opening-remarks-at-the-media-briefing-on-covid-19---11-march-2020, 2020. (accessed 2022-03-15).
5. Learning from history: Coronavirus outbreaks in the past;Arora;Dermatologic Therapy,2020