1. Department of Rheumatology and Immunology; Peking University People's Hospital; Beijing China
2. Duoding Street Community Health Center; Peking University Shougang Hospital; Beijing China
3. Department of Rheumatology and Immunology; Peking University Shougang Hospital; Beijing China
4. Department of Rheumatology and Immunology; Second Hospital of Shanxi Medical University; Taiyuan China
5. Department of Rheumatology and Immunology; The First Affiliated Hospital; Baotou Medical College; Baotou China
6. Department of Rheumatology; China-Japan Friendship Hospital; Beijing China
7. Department of Clinical Immunology; Xijing Hospital; Fourth Military Medical University; Xi'an China
8. Department of Rheumatology and Immunology; Second Hospital of Hebei Medical University; Shijiazhuang China
9. Department of Rheumatology and Immunology; Peking University Third Hospital; Beijing China
10. Department of Rheumatology and Immunology; The Third Hospital of Hebei Medical University; Shijiazhuang China
11. Department of Rheumatology and Immunology; The Affiliated Kailuan Hospital of North China Coal Medical University; Tangshan China
12. Department of Rheumatology and Clinical Immunology; Peking University First Hospital; Beijing China
13. Department of Rheumatology and Immunology; Bethune International Peace Hospital of PLA; Shijiazhuang China
14. Department of Rheumatology and Immunology; Handan Central Hospital; Handan China
15. Department of Rheumatology and Immunology; The People's Hospital of Hebei Province; Shijiazhuang China
16. Department of Rheumatology; the People's Hospital of Guangxi Zhuang Autonomous Region; Nanning China
17. Department of Rheumatology and Immunology; Beijing Shunyi Hospital; Beijing China
18. Department of Rheumatology; Tongji Hospital; Tongji Medical College; Huazhong University of Science and Technology; Wuhan China
19. Department of Rheumatology; The First Affiliated Hospital; Sun Yat-sen University; Guangzhou China
20. Department of Rheumatology and Immunology; Beijing Hospital; Beijing China
21. Department of Rheumatology; Shandong University Qilu Hospital; Jinan China
22. Department of Rheumatology; Second Hospital of Lanzhou University; Lanzhou China