1. Department of Nephrology and Rheumatology, Aichi Medical University School of Medicine, Nagakute, Japan;
2. Department of Nephrology and Rheumatology, Tajimi City Hospital, Tajimi, Japan;
3. Department of Pathology, Aichi Medical University School of Medicine, Nagakute, Japan;
4. Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Matsumoto, Japan