1. Anaerobe Laboratory, Department of Microbiology, Institute of Biomedical Science, University of São Paulo, São Paulo, SP, Brazil
2. Veterans Affairs, West Los Angeles Medical Center, Los Angeles, CA, USA
3. Department of Medicine, School of Medicine, University of California, Los Angeles, CA, USA
4. Department of Microbiology, Immunology and Molecular Genetics, School of Medicine, University of California, Los Angeles, CA, USA