1. Arthritis Clinic & Research Center Peking University People's Hospital Peking University Beijing China
2. Arthritis Institute Peking University Beijing China
3. Orthopedic Department Yantaishan Hospital Yantai Shandong China
4. Kolling Institute University of Sydney Sydney New South Wales Australia
5. Evidence Based Social Science Research Center School of Public Health Lanzhou University Lanzhou Gansu China
6. Department of Health Research Methods, Evidence and Impact McMaster University Hamilton Ontario Canada