1. Okinawa Institute of Advanced Sciences, Uruma, Japan
2. Okinawa Industrial Technology Center, Uruma, Japan
3. Department of Environmental and Preventive Medicine, Oita University Faculty of Medicine, Yufu, Japan
4. Pharmacogenomics Project, Kyoto University Graduate School of Medicine, Kyoto, Japan
5. Department of Endoscopy, University Hospital, University of the Ryukyus, Nishihara, Japan
6. Department of Medicine–Gastroenterology, Baylor College of Medicine and Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA