1. Department of Rheumatology and Clinical Immunology, The First Hospital of Xiamen University, Xiamen 361003, China
2. Laboratory of Autoimmunity, School of Biological Sciences, University of Texas at El Paso, El Paso, TX 79968, USA
3. Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198-7660, USA
4. Department of Rheumatology, Peking Union Medical College Hospital, Beijing 100032, China