aDivision of Rheumatology, Department of Internal Medicine, Tokyo Women's Medical University School of Medicine

bDepartment of Allergy and Rheumatology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan

Correspondence to Masataka Kuwana, MD, PhD, Department of Allergy and Rheumatology, Graduate School of Medicine, Nippon Medical School, 1-1-5 Sendagi Bunkyo-ku, Tokyo 113-8603, Japan. Tel: +81 3 3882 2131; e-mail: [email protected]