1. Centre for Health Protection (2020). Countries/areas with reported cases of Coronavirus Disease-2019. Retrieved from Centre for Health Protection, Web site: https://www.chp.gov.hk/files/pdf/statistics_of_the_cases_novel_coronavirus_infection_en.pdf.
2. Policies on the use of respiratory protection for hospital health workers to protect from coronavirus disease (COVID-19);Chughtai;International Journal of Nursing Studies, 105,2020
3. Behind the mask. Journey through an epidemic: Some observations of contrasting public health responses to SARS;Syed;Journal of Epidemiology & Community Health,2003
4. World Health Organisation (2020a). Coronavirus disease (COVID-19) advice for the public: When and how to use masks. Retrieved from World Health Organisation, Web site: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks.
5. World Health Organisation (2020b). Advice on the use of masks in the context of COVID-19. Retrieved from World Health Organisation, Web site: https://apps.who.int/iris/bitstream/handle/10665/331693/WHO-2019-nCov-IPC_Masks-2020.3-eng.pdf?sequence=1&isAllowed=y.