1. Department of Medicine and Biosystemic Science Kyushu University Graduate School of Medical Science FukuokaJapan
2. Department of Haematology National Hospital Organisation Kyushu Medical Centre FukuokaJapan
3. Department of Haematology Hiroshima Red Cross Hospital and Atomic‐bomb Survivors Hospital HiroshimaJapan
4. Department of Internal Medicine Matsuyama Red Cross Hospital MatsuyamaJapan
5. Department of Internal Medicine and Rheumatology National Hospital Organisation Kyushu Medical Centre FukuokaJapan
6. Department of Rheumatology Hiroshima Red Cross Hospital and Atomic‐bomb Survivors Hospital HiroshimaJapan
7. Centre for Rheumatic Diseases Matsuyama Red Cross Hospital MatsuyamaJapan
8. Department of Anatomic Pathology Pathological Sciences Graduate School of Medical Sciences Kyushu University KyushuJapan
9. Department of Diagnostic Pathology Matsuyama Red Cross Hospital MatsuyamaJapan
10. Department of Pathology Kurume University Faculty of Medicine FukuokaJapan
11. Department of Pathology Fukuoka University Faculty of Medicine Fukuoka Japan