1. Department of Hematology and Rheumatology, Hanzhong Central Hospital, Hanzhong, Shaanxi 723000, P.R. China
2. Department of Clinical Immunology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
3. Department of Pathology, Hanzhong Central Hospital, Hanzhong, Shaanxi 723000, P.R. China
4. Department of Rheumatology and Immunology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi 710038, P.R. China