1. Department of Molecular Diagnostic Pathology, School of Medicine, Iwate Medical University , Yahaba , Japan
2. Division of Gastroenterology, Department of Internal Medicine, School of Medicine, Iwate Medical University , Yahaba , Japan
3. Department of Surgery, School of Medicine, Iwate Medical University , Yahaba , Japan
4. Department of Molecular Biology, School of Medicine, Sapporo Medical University , Sapporo , Japan