1. Department of Hematology, The Affiliated Changsha Hospital, Hunan Normal University, Changsha, Hunan 410006, P.R. China
2. Department of Pathology, The Affiliated Tumor Hospital, Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, P.R. China
3. Department of Hematology, Changsha Central Hospital, Changsha, Hunan 410018, P.R. China