[1] Kawasaki Med Sch, Dept Rheumatol, Kurashiki, Okayama, Japan
[2] Prefectural Univ Hiroshima, Fac Life & Environm Sci, Dept Life Sci, Hiroshima, Japan
[3] Kawasaki Med Sch, Dept Immunol & Mol Genet, Kurashiki, Okayama, Japan
[4] Kyushu Univ, Beppu Hosp, Dept Internal Med, Beppu, Oita, Japan
[5] Kyoto Univ, Grad Sch Med, Dept Pediat, Kyoto, Japan