1. Department of Hematology and Rheumatology, Tohoku University Graduate School of Medicine, Sendai, Miyagi
2. Department of Hematology, Chiba University Graduate School of Medicine, Chiba
3. Department of Hematology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki
4. Department of Hematology and Oncology, Nagoya Daini Red Cross Hospital, Nagoya, Aichi
5. Sanofi K.K., Shinjuku-ku, Tokyo
6. Department of Hematology, National Cancer Center Hospital, Chuo-ku, Tokyo, Japan