1. The General Hospital of Ningxia Medical University, Yinchuan 750004, China
2. College of Life Science, Ningxia University, Yinchuan, Ningxia 750021, China
3. Department of Rheumatology, The General Hospital of Ningxia Medical University, Yinchuan 750004, China
4. Institute of Human Stem Cell Research at The General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750004, China