1. The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
2. Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
3. Rheumatology, Sanno Medical Center, Tokyo, Japan
4. Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, Tokyo, Japan
5. Division of Rheumatology and Immunology, Nagahama City Hospital, Shiga, Japan
6. KAN Research Institute, Inc, Kobe, Japan
7. Eisai Co. Ltd, Tokyo, Japan