1. Department of Pathology and Cell Biology, Graduate School of Medicine and Faculty of Medicine University of the Ryukyus Okinawa Japan
2. Department of Pathology and Laboratory Medicine Nagoya University Hospital Aichi Japan
3. Department of Hematology Okinawa Prefectural Nanbu Medical Center and Children's Medical Center Okinawa Japan
4. Department of Pathology Okinawa Prefectural Nanbu Medical Center and Children's Medical Center Okinawa Japan