1. Department of Rheumatology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan;
2. Department of Neurology and Rheumatology, Shinshu University School of Medicine, Matsumoto, Japan;
3. Department of Nephrology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan;
4. Department of Pathology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan;
5. Department of Hematology, Hiroshima City Hiroshima Citizens Hospital, Hiroshima, Japan