1. Rheumatology and Immunology Department, People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, Ningxia Hui Autonomous Region 750000, P.R. China
2. Journal of Modern Clinical Medicine, General Hospital of Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region 750000, P.R. China
3. Central Laboratory, People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, Ningxia Hui Autonomous Region 750000, P.R. China