1. The First Department of Internal Medicine, Kitakyushu, Japan
2. Wakamatsu Hospital, Kitakyushu, Japan
3. Department of Clinical Nursing, School of Health Sciences, Kitakyushu, Japan
4. Department of Pathology, University of Occupational and Environmental Health Kitakyushu, Kitakyushu, Japan
5. Department of Internal Medicine, Kitakyushu General Hospital, Kitakyushu, Japan
6. Department of Internal Medicine, Tobata General Hospital, Kitakyushu, Japan
7. Department of Internal Medicine, Ghent University, Ghent, Belgium
8. Department of Rheumatology, Ghent University Hospital, Ghent, Belgium
9. Research Laboratories and Academic Division of Rheumatology, Department of Internal Medicine, University of Genova, San Martino Polyclinic Hospital, Geneva, Italy