1. Diagnostic testing for severe acute respiratory syndrome-related coronavirus-2: a narrative review;Cheng;Ann Intern Med,2020
2. Worldometersinfo. Reported cases and deaths by country, territory, or conveyance. Dover, Delaware, U.S.A. https://www.worldometers.info/coronavirus/[Accessed 17 May 2020].
3. Sapporo Medical University School of Medicine. Trajectory analysis of new coronavirus COVID-19 cases and deaths by country. https://web.sapmed.ac.jp/canmol/coronavirus/trajectory_e.html) [Accessed 17 May 2020]..
4. Interactive web-based graphs of novel coronavirus COVID-19 cases and deaths per population by country;Idogawa;Clin Infect Dis,2020
5. The Strait Times. Coronavirus: Singapore Govt will no longer discourage wearing of masks, to give reusable masks to all households. https://www.straitstimes.com/singapore/health/coronavirus-govt-will-no-longer-discourage-wearing-of-masks-to-give-reusable-masks [Accessed 28 May 2020]..