Relationship between intestinal parasitic infection in children and soil contamination in a urban slum - Korkes, Fernando; Kumagai, Fabiane U.; Belfort, Rubens N.; Szejnfeld, Denis; Abud, Thiago G.; Kleinman, Ana; Florez, Gabriela M.; Szejnfeld, Tania; Chieffi, Pedro Paulo (Journal of tropical pediatrics, 2009)