Vidal, Jorge Eugenio. “Research on the Biology of the Pneumococcus and Pneumococcal Diseases: The Number One Cause of Death in Children Worldwide.”. Horizonte Sanitario 16, no. 1 (January 16, 2017): 5-7. Accessed May 13, 2024. https://revistahorizonte.ujat.mx/index.php/horizonte/article/view/1518.