1. Department of Hematology, Oita Prefectural Hospital, Oita, Japan,
2. Department of Hematology, Oita University Hospital, Oita, Japan,
3. Department of Hematology, JCHO Nankai Medical Center, Oita, Japan,
4. Department of Hematology, Almeida Memorial Hospital, Oita, Japan,
5. Department of Hematology, Oita Kouseiren Tsurumi Hospital, Oita, Japan