1. Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Suita, Japan
2. Department of Gastroenterology, Osaka General Medical Center, Osaka, Japan
3. Department of Gastroenterology, Toyonaka Municipal Hospital, Toyonaka, Japan
4. Department of Gastroenterology, Osaka Police Hospital, Osaka, Japan
5. Department of Gastroenterology, Osaka National Hospital, National Hospital Organization, Osaka, Japan
6. Department of Gastroenterology, Sakai Municipal Hospital, Sakai, Japan
7. Department of Gastroenterology, Kansai Rosai Hospital, Amagasaki, Japan
8. Department of Gastroenterology, Minoh City Hospital, Minoh, Japan
9. Department of Gastroenterology, Itami City Hospital, Itami, Japan
10. Department of Gastroenterology, Ikeda Municipal Hospital, Ikeda, Japan
11. Department of Gastroenterology, Osaka Rosai Hospital, Sakai, Japan
12. Department of Gastroenterology, Osaka Kosei-nenkin Hospital, Osaka, Japan