1. Department of Hematology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan,
2. Department of Pathology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan,
3. Department of Immunology and Rheumatology, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan