1. Department of Rheumatology and Infectious Diseases, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan;
2. Department of Internal Medicine, Kawasaki Municipal Hospital, Kawasaki, Kanagawa, Japan;
3. Center for Autoimmune and Musculoskeletal Disease, The Feinstein Institute for Medical Research, Manhasset, NY, USA