1. Department of Medicine, Division of Gastroenterology, Hepatology, and Nutrition, Virginia Commonwealth University and Richmond VA Medical Center, Richmond, Virginia, USA
2. Department of Microbiology and Immunology, Virginia Commonwealth University and Richmond VA Medical Center, Richmond, Virginia, USA
3. Center for Advanced Brain Imaging, Georgia Institute of Technology, Atlanta, Georgia, USA
4. Collaborative Advanced Research Imaging Center, Virginia Commonwealth University, Richmond, Virginia, USA
5. Microbiome Analysis Center, George Mason University, Manassas, Virginia, USA