Protecting healthcare workers in the COVID-19 pandemic: respirator shortages and health policy responses in South America - Kevin J. Blair; Samuel Martinez-Vernaza; Eddy Segura; José Luis Gallardo Barrientos; Kent Garber; Sandra M. Gualtero-Trujillo; Catherine Juillard; Rodolfo Castro (Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz, 2020)