[1] Chiba Univ Hosp, Dept Allergy & Clin Immunol, Chiba, Japan
[2] Matsudo City Hosp, Rheumatol Ctr, Matsudo, Chiba, Japan
[3] Chiba Aoba Municipal Hosp, Dept Internal Med, Chiba, Japan
[4] Natl Hosp Org Shimoshizu Hosp, Dept Rheumatol, Yotsukaido, Japan
[5] Asahi Gen Hosp, Res Ctr Allergy & Clin Immunol, Asahi, Japan
[6] Natl Hosp Org Chiba East Hosp, Dept Rheumatol Allergy & Clin Immunol, Chiba, Japan