1 Department of Nephrology, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Niigata, Japan. Electronic address: ryokouda@gmail.com.
2 Department of Nephrology, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Niigata, Japan.
3 Department of Pathology, Uonuma Institute of Community Medicine, Niigata University Medical and Dental Hospital, Niigata, Japan.
4 Division of Clinical Nephrology and Rheumatology, Niigata University Graduate School of Medical and Dental Science, Niigata, Japan.