1. Division of Gastroenterology, John T. Milliken Department of Medicine, Washington University in St. Louis School of Medicine, St. Louis, Missouri, USA
2. Division of Infectious Diseases, John T. Milliken Department of Medicine, Washington University in St. Louis School of Medicine, St. Louis, Missouri, USA
3. Department of Orthopedic Surgery, Naval Hospital Camp Pendleton, Camp Pendleton, California, USA
4. Division of Gastroenterology and Hepatology, College of Medicine, Mayo Clinic, Rochester, Minnesota, USA
5. Division of Public Health Sciences, Department of Surgery, Washington University in St. Louis School of Medicine, St. Louis, Missouri, USA