1. Department of Rheumatology, Niigata Rheumatic Center, Shibata City, Niigata, Japan;
2. Division of Clinical Nephrology and Rheumatology Niigata University Graduate School of Medical and Dental Sciences, Niigata City, Niigata, Japan;
3. Department of Gastroenterology and Hepatology, Saitama Medical Center, Saitama Medical University, Japan