1. Department of Surgery, School of Medicine, Iwate Medical University, Iwate 028-3695, Japan
2. Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Iwate Medical University, Iwate 028-3695, Japan
3. Department of Clinical Oncology, School of Medicine, Iwate Medical University, Iwate 028-3695, Japan
4. Division of Biomedical Research and Development, Iwate Medical University Institute for Biomedical Sciences, Iwate 028-3694, Japan