1. Division of Rheumatology, Department of Internal Medicine Ewha Womans University College of Medicine Seoul Korea
2. Department of Preventive Medicine Ewha Womans University College of Medicine Seoul Korea
3. Clinical Research Center for Rheumatoid Arthritis (CRCRA) Hanyang University Hospital for Rheumatic Diseases Seoul Korea
4. Department of Rheumatology Hanyang University Hospital for Rheumatic Diseases Seoul Korea
5. Department of RheumatologyCatholic University of Daegu School of Medicine Daegu Korea
6. Department of RheumatologyDong‐A University Hospital Busan Korea
7. Department of RheumatologyKyung Hee University Hospital Seoul Korea
8. Department of RheumatologySamsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea
9. Department of RheumatologyChonnam National University Medical School and Hospital Gwangju Korea
10. Department of RheumatologyInje University Ilsan Paik Hospital Goyang Korea