1. Department of Gastroenterology and Hepatology Baylor College of Medicine and Michael E. DeBakey Veterans Affairs Medical Center Houston Texas
2. Department of Environmental and Preventive Medicine Oita University Faculty of Medicine Yufu Japan
3. Department of Molecular Virology and Microbiology Baylor College of Medicine Houston Texas
4. Department of Molecular Pathology Oita University Faculty of Medicine Yufu Japan
5. Gastroenterological Medicine Rumoi City Hospital Rumoi Japan