1. Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto;
2. Department of Clinical Pathology, Kyoto University Hospital, Shogoin Kawahara-cho, Sakyo-ku, Kyoto;
3. Department of Hematology and Clinical Immunology, Kobe City Medical Center General Hospital, Minatojima-Nakamachi, Chuo-ku, Kobe; and
4. Department of Hematology, Tenri Hospital, Mishima-cho, Tenri, Nara, Japan