1. Department of Rheumatology, Hospital at Gangdong School of Medicine Kyung Hee University Seoul South Korea
2. Department of Rheumatology Chonnam National University Hospital Gwangju Korea
3. Department of Rheumatology Catholic University of Daegu School of Medicine Daegu Korea
4. Department of Rheumatology SMG‐SNU Boramae Medical Center Seoul Korea
5. Department of Rheumatology Inha University Hospital Incheon Korea
6. Pfizer Pharmaceuticals Korea Limited Seoul Korea
7. Department of Biostatistics Korea University College of Medicine Seoul Korea
8. Department of Rheumatology The Hanyang University Hospital for Rheumatic Diseases Seoul Korea