Sydney Correia Leão, and Tania Maria de Andrade Rodrigues. “The Relationship Between Different Types of Streptococci and Pharyngotonsillitis: A Systematic Review”. Otolaryngology, vol. 2, no. 2, Apr. 2016, pp. 47-50, https://openventio.us/index.php/OOJ/article/view/2440.