1. Department of hematology, Kochi health sciences center, Kochi, Japan,
2. Department of diagnostic of pathology, Kochi health sciences center, Kochi, Japan,
3. Department of hematology, Japanese Red Cross Kochi Hospital, Kochi, Japan,
4. Department of diagnostic pathology, Japanese Red Cross Kochi Hospital, Kochi, Japan,
5. Department of Pathology, National Cancer Center Hospital, Tokyo, Japan