[1] Univ Tsukuba, Grad Sch Comprehens Human Sci, Doctoral Program Life Syst Med Sci, Mol & Genet Epidemiol Lab, Tsukuba, Ibaraki 3058575, Japan
[2] Univ Tsukuba, Grad Sch Comprehens Human Sci, Doctoral Program Clin Sci, Div Clin Immunol, Tsukuba, Ibaraki 3058575, Japan
[3] Takikawa Municipal Hosp, Takikawa, Hokkaido, Japan
[4] Juntendo Univ, Dept Med, Div Rheumatol, Tokyo, Japan
[5] Juntendo Univ, Sch Med, Tokyo 113, Japan
[6] Matsuta Clin, Tokyo, Japan