1. Department of Rheumatology and Immunology, The Second Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541001, P.R. China
2. Shenzhen Futian Hospital for Rheumatic Diseases, Shenzhen, Guangdong 518040, P.R. China
3. Department of Hematology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China