Drumond, Karina Oliveira, and Francisco Assis Lima Costa. “ Forty Years of Visceral Leishmaniasis in the State of Piaui: A Review ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 53, no. 1, Feb. 2011, pp. 3-11, https://revistas.usp.br/rimtsp/article/view/31367.