Krzyzanowsky, Flávio, and Mario J. Avila-Campos. 2003. “ Detection of Non-Enterotoxigenic and Enterotoxigenic Bacteroides Fragilis in Stool Samples from Children in São Paulo, Brazil ”. Revista Do Instituto De Medicina Tropical De São Paulo 45 (4): 225-27. https://revistas.usp.br/rimtsp/article/view/30724.