1. Department of Rheumatology Peking Union Medical College Hospital Peking Union Medical College & Chinese Academy of Medical Sciences Key Laboratory of Rheumatology and Clinical Immunology Ministry of Education National Clinical Research Center on Rheumatology Ministry of Science & Technology Beijing China
2. Department of Rheumatology The Affiliated Hospital of Inner Mongolia Medical College Hohhot China
3. Department of Rheumatology The Second Affiliated Hospital of Nanchang University Nanchang China
4. Department of Rheumatology Southwest Hospital Third Military Medical University Chongqing China
5. Department of Rheumatology and Immunology First Affiliated Hospital China Medical University Shenyang China
6. Department of Rheumatology The First People's Hospital of Yunnan Province Kunming China
7. Department of Rheumatology The First Affiliated Hospital of Nanchang University Nanchang China
8. Department of Rheumatology The Fifth People’s Hospital of Datong Datong China
9. Department of Rheumatology The First Affiliated Hospital of Henan University of Science and Technology Luoyang China
10. Department of Clinical Immunology and Rheumatology Xijing Hospital affiliated to the Fourth Military Medical University Xi’an China
11. Department of Epidemiology and Bio‐statistics Institute of Basic Medical Sciences Chinese Academy of Medical Sciences & Peking Union Medical College Beijing China
12. Section of Rheumatology Yale School of Medicine New Haven CT USA