1. Korea University College of Medicine Seoul Korea
2. Division of Rheumatology Department of Internal Medicine Korea University Ansan Hospital Ansan‐si Korea
3. Soksiwon Clinic Incheon Korea
4. Ewha Womans University College of Nursing Seoul Korea
5. Department of Occupational and Environmental Medicine Busan Adventist Hospital Sahmyook Medical Centre Busan Korea
6. Division of Rheumatology Department of Internal Medicine Korea University Guro Hospital Seoul Korea