1. CDC. Centers for Disease Control and Prevention. Coronavirus advisory. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/social-distancing.html [last accessed April 18th, 2020].
2. WHO Declares COVID-19 a Pandemic;Cucinotta;Acta Biomed,2020
3. World Health Organization. (2020). Rational use of personal protective equipment (PPE) for coronavirus disease (COVID-19): interim guidance, 19 March 2020. World Health Organization. https://apps.who.int/iris/handle/10665/331498. License: CC BY-NC-SA 3.0 IGO.