1. Division of Clinical Nephrology and Rheumatology, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan;
2. Department of Health and Nutrition Faculty of Human Life Studies, University of Niigata Prefecture, Niigata, Japan;
3. University Health Center, Joetsu University of Education, Niigata, Japan;
4. Department of Medical Technology School of Health Sciences Faculty of Medicine, Niigata University, Niigata, Japan