1. Department of Gastroenterology, Fukaya Red Cross Hospital
2. Division of Gastroenterology and Hepatology, Department of Medicine, Nihon University School of Medicine
3. Department of Gastroenterology, Osaki Citizen Hospital
4. Department of Gastroenterology, Sendai City Hospital
5. Yamanashi Koseiren Health Care Center
6. Department of Gastroenterology, Chichibu Municipal Hospital