1. Department of Endoscopy and Division of Gastroenterology and Hepatology, Department of Internal Medicine; The Jikei University School of Medicine; Tokyo Japan
2. Department of Endoscopy; The Jikei University School of Medicine; Tokyo Japan
3. Department of Pediatric Surgery; Keio University School of Medicine; Tokyo Japan
4. Department of Surgery; Tokyo Metropolitan Children's Medical Center; Tokyo Japan
5. Department of Pediatric Surgery; Kagoshima University; Kagoshima Japan
6. Department of Physiology; Keio University School of Medicine; Tokyo Japan
7. Department of Neuropathology, Brain Bank for Aging Research; Tokyo Metropolitan Institute of Gerontology; Tokyo Japan