1. Department of Gastroenterology, Akita University Graduate School of Medicine
2. Akita Foundation for Healthcare
3. Department of Gastroenterology, Omagari Kosei Medical Center
4. Department of Gastroenterology, Odate Municipal General Hospital
5. Department of Gastroenterology, Noshiro Kosei Medical Center
6. Department of Gastroenterology, Northern Akita Municipal Hospital
7. Department of Gastroenterology, Akita Kousei Medical Center
8. Department of Gastroenterology, Akita City Hospital
9. Digestive Disease Center, Akita Red Cross Hospital
10. Department of Gastroenterology, Hiraka General Hospital
11. Department of Gastroenterology, Yuri Kumiai General Hospital
12. Department of Clinical Oncology, Akita University Graduate School of Medicine