1. WHO website. Coronavirus disease (COVID-19) technical guidance: early investigations. Available at: http://www.who.int/emergencies/diseases/novel-coronavirus-2019/technical-guidance/early-investigations. Accessed February 15, 2020.
2. WHO website. Statement on the second meeting of the International Health Regulations (2005) Emergency Committee regarding the outbreak of novel coronavirus (2019-nCoV). Available at: http://www.who.int/news-room. Accessed February 25, 2020.
3. A novel coronavirus associated with severe acute respiratory syndrome;KSIAZEK;N Engl J Med,2003
4. Identification of a Novel Coronavirus in Patients with Severe Acute Respiratory Syndrome;Drosten;N Engl J Med,2003
5. Isolation of a Novel Coronavirus from a Man with Pneumonia in Saudi Arabia;Zaki;N Engl J Med,2012