1. Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, China
2. Anhui provincial laboratory of population health & major disease screening and diagnosis, Hefei, China
3. Department of Rheumatology, Anhui Provincial Hospital, Hefei, China
4. Division of Rheumatology, Penn State University Hershey College of Medicine, Hershey, PA, USA