[1] Nagoya Univ, Grad Sch Med, Nagoya, Aichi 4648601, Japan
[2] Hokkaido Univ, Sapporo, Hokkaido, Japan
[3] Tokyo Med & Dent Univ, Tokyo, Japan
[4] Kyoto Univ, Grad Sch Med, Kyoto, Japan
[5] Tokyo Med Univ, Osaka, Japan
[6] Univ Tsukuba, Inst Clin Med, Tsukuba, Ibaraki 305, Japan
[7] Keio Univ, Sch Med, Tokyo, Japan
[8] Univ Occupat & Environm Hlth, Kitakyushu, Fukuoka 807, Japan
[9] Chugai Pharmaceut, Tokyo, Japan
[10] Tokyo Womens Med Univ, Inst Rheumatol, Tokyo, Japan