Seiji Noda1,2, Yoji Komiya3,4, Makoto Soejima3,5. 1. Department of Rheumatology, Ome Municipal General Hospital, Ome, Japan. noda.rheu@tmd.ac.jp. 2. Department of Rheumatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan. noda.rheu@tmd.ac.jp. 3. Department of Rheumatology, Ome Municipal General Hospital, Ome, Japan. 4. Department of Rheumatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan. 5. Department of Rheumatology, Soka Municipal Hospital, Soka, Japan.