Llanos-Tejada, Félix, and Hernán del Castillo. 2014. “Association Between Severe Tuberculosis in Children and Previous BCG Immunization in a National Referral Hospital, Peru 1990-2000”. Revista Peruana De Medicina Experimental Y Salud Pública 29 (1). https://doi.org/10.17843/rpmesp.2012.291.313.