1 Department of Rheumatology and Immunology, Beijing Key Laboratory for Rheumatism and Immune Diagnosis, Peking University People's Hospital, Beijing 100044, China; Peking-Tsinghua Center for Life Sciences, Beijing 100871, China. Electronic address: li99@bjmu.edu.cn.
2 Department of Rheumatology and Immunology, Beijing Key Laboratory for Rheumatism and Immune Diagnosis, Peking University People's Hospital, Beijing 100044, China.