1. Department of Medicine, Division of Hematology and Oncology, Kyoto Prefectural University of Medicine, Kyoto, Japan;
2. Department of Hematology, Japanese Red Cross Kyoto Daiichi Hospital, Kyoto, Japan;
3. Department of Hematology, Japanese Red Cross Kyoto Daini Hospital, Kyoto, Japan;
4. Department of Hematology, Aiseikai Yamashina Hospital, Kyoto, Japan;
5. Department of Internal Medicine, Otsu Municipal Hospital, Otsu, Japan;
6. Department of Biostatistics, Kyoto Prefectural University of Medicine, Kyoto, Japan