1. 1. World Health Organization. Novel coronavirus (2019-nCoV) situation report - 1. 21 January 2020. Available at: https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200121-sitrep-1-2019-ncov.pdf. Accessed March 8, 2020.
2. 2. Worldometer. COVID-19 coronavirus outbreak. 8 March 2020. Available at: https://www.worldometers.info/coronavirus/#countries. Accessed March 8, 2020.
3. 3. World Health Organization. WHO Director-General's opening remarks at the media briefing on COVID-19 - 5 March 2020. Available at: https://www.who. int/dg/speeches/detail/who-director-general-s-opening-remarks-at-themedia-briefing-on-covid-19---5-march-2020. Accessed March 8, 2020.
4. Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding;Lu;Lancet,2020
5. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China;Huang;Lancet,2020