1. Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, Kansas, USA
2. Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas, USA
3. Department of Microbiology and Immunology, Georgetown University, Washington, DC, USA
4. Department of Internal Medicine, Division of Gastroenterology, Liver Center, University of Kansas Medical Center, Kansas City, Kansas, USA