1. Department of Gastroenterology, National Hospital Organization, Shimoshizu Hospital, Yotsukaido, Chiba 284‑0003, Japan
2. Department of Radiology, National Hospital Organization, Shimoshizu Hospital, Yotsukaido, Chiba 284‑0003, Japan
3. Department of Neurology, National Hospital Organization, Shimoshizu Hospital, Yotsukaido, Chiba 284‑0003, Japan
4. Department of Rheumatology, National Hospital Organization, Shimoshizu Hospital, Yotsukaido, Chiba 284‑0003, Japan
5. Department of Pediatrics, National Hospital Organization, Shimoshizu Hospital, Yotsukaido, Chiba 284‑0003, Japan
6. Department of Neurosurgery, National Hospital Organization, Shimoshizu Hospital, Yotsukaido, Chiba 284‑0003, Japan