Guerra-Centeno, D., Burmester-Ruiz, L., Guerra-Burmester, P., Guerra-Burmester, D. and Villatoro-Paz, F. (2020) “Voluntary and mandatory use of face mask by pedestrians in Guatemala City during the COVID-19 pandemic”, Ciencia, Tecnología y Salud, 7(3), pp. 477–482. doi: 10.36829/63CTS.v7i3.894.