1. Department of Internal Medicine, Hidaka Hospital, Takasaki, Gunma, Japan
2. Department of Internal Medicine, Mitsubishi Mihara Hospital, Mihara, Hiroshima, Japan
3. Junpukai Health Maintenance Center, Okayama, Okayama, Japan
4. Health Center, Shimane Environment and Health Public Corporation, Matsue, Shimane, Japan
5. Department of Internal Medicine, Meiwa Hospital, Nishinomiya, Hyogo, Japan
6. Department of Preventive Medicine, Matsue Red Cross Hospital, Matsue, Shimane, Japan
7. Public Health Center, Okazaki City Medical Association, Okazaki, Aichi, Japan
8. Department of Internal Medicine, Saiseikai Karatsu Hospital, Karatsu, Saga, Japan
9. Department of Gastroenterology and Hepatology, Shinko Hospital, Kobe, Hyogo, Japan
10. Department of Medical Innovation, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, Japan
11. Department of Laboratory Medicine, The Jikei University School of Medicine, Minato-ku, Tokyo, Japan
12. Department of Gastroenterology, Nippon Medical School Graduate School of Medicine, Bunkyo-ku, Tokyo, Japan
13. Department of General Internal Medicine 2, Kawasaki Medical School General Medical Center, Okayama, Japan
14. Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, Japan