1. Department of Allergy and Respiratory Medicine, Okayama University Hospital, Japan
2. Center for Clinical Oncology, Okayama University Hospital, Japan
3. Department of Internal Medicine, Kaneda Hospital, Japan
4. Department of Hepato-Biliary-Pancreatic Surgery, Okayama University Hospital, Japan
5. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Japan
6. Department of Gastroenterological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Japan
7. Department of Hematology, Oncology and Respiratory Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Japan