1. Department of Medicine; Division of Gastroenterology and Hematology/Oncology; Asahikawa Medical University; Asahikawa Japan
2. Department of Gastrointestinal Immunology and Regenerative Medicine; Asahikawa Medical University; Asahikawa Japan
3. Department of Gastroenterology; Nayoro City General Hospital; Nayoro Japan
4. Department of Gastroentelorogy; Asahikawa Red Cross Hospital; Asahikawa Japan