1. Division of Molecular and Cellular Biology, Kobe University Graduate School of Medicine, Kobe, Japan
2. Division of Gastrointestinal Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
3. Division of Clinical Virology, Kobe University Graduate School of Medicine, Kobe, Japan
4. Department of Diagnostic Pathology, Kobe University Graduate School of Medicine, Kobe, Japan
5. Division of Medical Oncology/Hematology, Kobe University Graduate School of Medicine, Kobe, Japan
6. Cancer Center, Kobe University Hospital, Kobe, Japan