1. Department of Nephrology and Rheumatology, Gunma University Graduate School of Medicine, Maebashi, Japan
2. Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, Maebashi, Japan
3. Division of Virology, Department of Infection and Immunity, Jichi Medical University School of Medicine, Shimotsuke, Japan
4. Department of Rheumatology and Applied Immunology, Faculty of Medicine, Saitama Medical University, Saitama, Japan
5. Division of Gastroenterology and Hepatology Internal Medicine, Saitama Medical University, Saitama, Japan
6. Department of Rheumatology and Nephrology, Japan Red Cross Maebashi Hospital, Maebashi, Japan