1. Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, TX
2. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
3. Digestive Disease Center, International University of Health and Welfare, Mita Hospital, Japan
4. Departamento de Clinica e Cirurgia Veterinarias, Escola de Veterinaria, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
5. Department of Clinical Science, Quantitative Biomedical Research Center, University of Texas Southwestern Medical Center, Dallas, TX
6. Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX
7. Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX
8. Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN
9. Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX