1. Division of Rheumatology, Department of Internal Medicine Seoul National University Bundang Hospital Seongnam Gyeonggi‐do Korea
2. Department of Internal Medicine Seoul National University College of Medicine Seoul Korea
3. Division of Rheumatology, Department of Internal Medicine Yonsei University College of Medicine Seoul Korea
4. Department of Rheumatology Ajou University School of Medicine Suwon Gyeonggi‐do Korea