1. Niigata University Health Administration Center Niigata City Japan
2. Department of Rheumatology Niigata Rheumatic Center Shibata City Japan
3. Division of Clinical Nephrology and Rheumatology Niigata University Graduate School of Medical and Dental Sciences Niigata City Japan
4. Department of Medical Technology, School of Health Sciences, Faculty of Medicine Niigata University Niigata City Japan