1. Department of Rheumatology, Clinical Research Center for Rheumatic Diseases, NHO Kumamoto Saishunsou National Hospital, Kumamoto, Japan.
2. Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Japan.
3. Molecular and Genetic Epidemiology Laboratory, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.
4. Department of Respiratory Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Japan.
5. Institute of Rheumatology, Tokyo Women's Medical University, Tokyo, Japan.