1. Department of Hematology Kobe City Medical Center General Hospital Kobe Hyogo Japan
2. Department of Pathology Kobe City Medical Center General Hospital Kobe Hyogo Japan
3. Department of Virology Nagoya University Graduate School of Medicine Nagoya Aichi Japan
4. PRESTO, Japan Science and Technology Agency (JST) Kawaguchi Saitama Japan
5. Department of Virology Nagoya City University Graduate School of Medical Sciences Nagoya Aichi Japan
6. Department of Diagnostic Pathology Kyoto University Hospital Kyoto Japan
7. Department of Hematology/Oncology, Research Hospital, The Institute of Medical Science The University of Tokyo Tokyo Japan
8. Department of Pathology and Tumor Biology, Graduate School of Medicine Kyoto University Kyoto Japan