1. Department of Nursing, Pusan National University Yangsan Hospital, Yangsan, Korea.
2. Division of Rheumatology, Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
3. Division of Rheumatology, Department of Internal Medicine, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
4. Division of Rheumatology, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
5. Division of Rheumatology, Department of Internal Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.