1. Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan;
2. Division of Pathology, Gifu University Hospital, Gifu, Japan;
3. Faculty of Health Sciences, Hokkaido University, Sapporo, Japan;
4. Department of Dermatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan