1. Departments of Microbiology & Immunology, University of Minnesota Medical School, Minneapolis, MN, USA
2. Department of Laboratory Medicine and Pathology, Division of Clinical Microbiology, Mayo Clinic, Rochester, MN, USA
3. Division of Gastroenterology, Department of Medicine, Mayo Clinic, Rochester, MN, USA
4. Department of Medicine, Division of Infectious Disease, Mayo Clinic, Rochester, MN, USA
5. Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis, MN, USA