1. Department of Oral Medicine; Pontifical Catholic University of Rio Grande do Sul (PUCRS); Porto Alegre RS Brazil
2. Geobiology Laboratory; Institute of Petroleum and Natural Resources; Pontifical Catholic University of Rio Grande do Sul (PUCRS); Porto Alegre RS Brazil
3. Immunology and Microbiology Laboratory; Biosciences School; Pontifical Catholic University of Rio Grande do Sul (PUCRS); Porto Alegre RS Brazil