1. World Health Organization. Coronavirus disease 2019 (COVID-19) situation report–159 [cited 2020 Jun 28]. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports
2. Centers for Disease Control and Prevention. Coronavirus disease 2019 (COVID-19). World map [cited 2020 Jun 28]. https://www.cdc.gov/coronavirus/2019-ncov/global-covid-19/world-map.html
3. Hanson KE, Caliendo AM, Arias CA, Janet A, Englund JA, Lee MJ, Infectious Diseases Society of America guidelines on the diagnosis of COVID-19 [cited 2020 May 6]. https://www.idsociety.org/practice-guideline/covid-19-guideline-diagnostics
4. Guidelines for laboratory diagnosis of coronavirus disease 2019 (COVID-19) in Korea.;Hong;Ann Lab Med,2020
5. Korea Centers for Disease Control and Prevention. COVID-19 [cited 2020 Jun 28]. http://ncov.mohw.go.kr