1. The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan , Kitakyushu, Japan
2. Department of Clinical Nursing, School of Health Sciences, University of Occupational and Environmental Health, Japan , Kitakyushu, Japan
3. Department of Rheumatology, Wakamatsu Hospital of the University of the Occupational and Environmental Health, Japan , Kitakyushu, Japan
4. Department of Rheumatology, Kawasaki Medical School , Okayama, Japan
5. Department of Rheumatology, Wakayama Medical University , Wakayama, Japan
6. Department of Radiology, University of Occupational and Environmental Health, Japan , Kitakyushu, Japan