Digestive tract microbiota in healthy volunteers - Zilberstein, Bruno; Quintanilha, Alina G.; Santos, Manoel A. A.; Pajecki, Denis; Moura, Eduardo G.; Alves, Paulo Roberto Arruda; Maluf Filho, Fauze; Souza, João Ary Ubriaco de; Gama Rodrigues, Joaquim José (Clinics, 2007)