1. Department of Internal Medicine, Kyushu University Beppu Hospital , Oita, Japan
2. Department of Rheumatology, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital , Hiroshima, Japan
3. Department of Medicine and Biosystemic Science, Graduate School of Medical Sciences, Kyushu University , Fukuoka, Japan
4. Department of Medical Education, Faculty of Medical Sciences, Kyushu University , Fukuoka, Japan
5. Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Hospital , Fukuoka, Japan
6. Department of Clinical Research, Rheumatology and Allergology, Osaka Minami Medical Center , Osaka, Japan
7. Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine , Tokyo, Japan