MacIntyre, CR; Chughtai, AA (9 de abril de 2015). «Facemasks for the prevention of infection in healthcare and community settings.». BMJ (Clinical Research Ed.)350: h694. PMID25858901. doi:10.1136/bmj.h694.
MacIntyre, CR; Chughtai, AA (9 de abril de 2015). «Facemasks for the prevention of infection in healthcare and community settings.». BMJ (Clinical Research Ed.)350: h694. PMID25858901. doi:10.1136/bmj.h694.