1. Department of Rheumatology, The First Affiliated Hospital, University of South China, Hengyang, Hunan 421001, P.R. China
2. Department of Hematology, The First Affiliated Hospital, University of South China, Hengyang, Hunan 421001, P.R. China
3. Molecular Biology Research Center and Center for Medical Genetics, School of Life Sciences, Central South University, Changsha, Hunan 410078, P.R. China