Affiliation: | 1. 3rd Dept. of Int. Med., Osaka City Univ. Med. Sch., Osaka 2. Dept. of Int. Med., Otsu Red Cross Hosp., Japan 3. Div. of Digest. System, Dept. of Int. Med., Tenri Hosp., Tenri City 4. Dept. of Prevent. Med., Kyoto Pref. Univ. Med., Kyoto 5. Dept. of Radiol., Kyoto Munic. Hosp., Kyoto 6. Tokyo Metropol. Komagome Hosp., Tokyo 7. 2nd Dept. of Pathol., Tohoku Univ. Sch. of Med., Sendai 8. 1st Dept. of Surg., Tohoku Univ. Sch. of Med., Sendai 9. Dept. of Surg., Univ. of Tokyo, Tokyo 10. Dept. of Pathol., Hamamatsu Med. Col., Hamamatsu 11. 3rd Dept. of Int. Med., Tohoku Univ. Sch. of Med., Sendai 12. Dept. of Med., Juntendo Univ., Tokyo 13. Dept. of Pathol., Tsukuba Univ., Ibaragi 14. Dept. of Surg., Yokohama Munic. Hosp., Yokohama 15. Dept. of Gener. Surg., Jichi Med. Sch., Tochigi 16. Dept. of Gener. Surg., Tokyo Metropol. Geriat. Hosp., Tokyo 17. 2nd Dept. of Surg., Yokohama City Univ., Yokohama 18. Gastroenterological Endoscopy Society, Japan 19. Dept. of Gastroent., Tenri Hosp., Tenri City 20. 1st Dept. of Int. Med., Yamaguchi Univ. Sch. of Med., Ube 21. Inst. of Gastroent., Tokyo Women’s Med. Col., Tokyo 22. Dept. of Prevent. Med., Japan 23. 3rd Dept. of Int. Med., Kyoto Prefect. Univ. of Med., Kyoto
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