[1] Teikyo Medical School,Department of Hygiene and Public Health
[2] the University of Tokyo,Office of International Academic Affairs, Graduate School of Medicine
[3] Keio University Hospital,Center for Inflammatory Bowel Diseases
[4] Chikushi Hospital,Department of Gastroenterology
[5] Fukuoka University,Department of Gastroenterology
[6] Keio University School of Medicine,Department of Epidemiology and Health Care Research, Graduate School of Medicine
[7] Kyoto University,undefined