Lopez Leon, S., Ayuzo , C. , Perelman , C. , Sepulveda , R. , Colunga-Pedraza, I.J. , Cuapio , A. and Wegman-Ostrosky , T. (2020) “FACE MASKS IN TIMES OF PANDEMICS, A HISTORICAL AND SCIENTIFIC REVIEW AND PRACTICAL RECOMMENDATIONS”, SciELO Preprints [Preprint]. doi:10.1590/SciELOPreprints.1551.