1. Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan;
2. First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health Japan, Kitakyushu, Japan;
3. Department of Allergy, National Hospital Organization, Chiba-East Hospital, Chiba, Japan;
4. Department of Internal Medicine, National Hospital Organization, Kanazawa Medical Center, Ishikawa, Japan;
5. Department of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama Medical University, Saitama, Japan;
6. Department of Rheumatology, Endocrinology and Nephrology, Hokkaido University Hospital, Hokkaido, Japan;
7. Department of Internal Medicine and Rheumatology, National Hospital Organization, Kyushu Medical Center, Fukuoka, Japan;
8. Department of Research and Development, AstraZeneca K.K, Osaka, Japan;
9. AstraZeneca, Gaithersburg, MD, USA