1. Department of Medicine and Clinical Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences,
Okayama, Japan
2. Division of Rheumatology/Clinical Immunology, Department of Medicine, Saitama Medical Center, Saitama Medical University,
Saitama, Japan
3. Department of Public Health, Jichi Medical University,
Tochigi, Japan
4. Center for Rheumatology, Okayama Saiseikai Hospital,
Okayama, Japan
5. First Department of Internal Medicine, Kyorin University School of Medicine,
Tokyo, Japan