1. The Third Department of Internal Medicine, Tohoku University School of Medicine
2. Division of Internal Medicine, Hiraga Sogo Hospital
3. Division of Internal Medicine, Tohoku Rosai Hospital
4. Division of Internal Medicine, Tsurugaya Open Hospital
5. Division of Internal Medicine, Iwaki Kyoritsu Hospital
6. Division of Internal Medicine, Hakodate Shiritsu Hospital
7. Division of Gastroenterology, Ohara General Hospital