1. Causes of COVID-19:https://www.mayoclinic.org/diseases-conditions/coronavirus/symptoms-causes/syc-20479963.
2. Myth busters: https:www.who.int novel-coronavirus-2019 advice-for-public.
3. WHO statement regarding cluster of pneumonia cases in Wuhan, China, Available:https://www.who.int/china/news/detail/09-01-2020.
4. World Health Organization. Coronavirus. World Health Organization, January 19, 2020. Available:https://www.who.int/health-topics/coronavirus.
5. A pneumonia outbreak associated with a new coronavirus of probable bat origin;Zhou;Nature,2020