1. Department of Rheumatology, National Hospital Organization Sagamihara National Hospital, Sagamihara, Japan;
2. Department of Clinical Laboratory, National Hospital Organization Sagamihara National Hospital, Sagamihara, Japan;
3. Molecular and Genetic Epidemiology Laboratory, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan;
4. Clinical Research Center for Allergy and Rheumatology, National Hospital Organization Sagamihara National Hospital, Sagamihara, Japan;
5. National Hospital Organization Tokyo National Hospital, Kiyose, Japan