1. Division of Epidemiology and Pharmacoepidemiology, Department of Rheumatology, School of Medicine, Tokyo Women’s Medical University, Tokyo, Japan;
2. Graduate School & Faculty of Medicine, Nagoya University School of Medicine, Nagoya, Japan;
3. Chiba Central Medical Center, Chiba, Japan;
4. Kyoto University Graduate School of Medicine, Kyoto, Japan;
5. Nihon University School of Medicine, Tokyo, Japan;
6. Faculty of Medicine, Kagoshima University School of Health Science, Kagoshima, Japan;
7. Keio University School of Medicine, Tokyo, Japan;
8. University of Occupational and Environmental Health, Fukuoka, Japan;
9. Juntendo University School of Medicine, Tokyo, Japan;
10. Bristol-Myers Squibb K.K., Tokyo, Japan;
11. Sapporo Medical Center NTT EC, Sapporo, Japan