1. Department of Nephrology, Rheumatology, Endocrinology and Metabolism, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama, Japan
2. Department of Medical Laboratory Science, Okayama University Graduate School of Health Sciences , Okayama, Japan
3. Department of Clinical Epidemiology, Kochi Medical School , Nanngoku, Japan
4. Department of Cardiovascular Medicine, Rheumatology, Kanazawa University Graduate School of Medical Sciences , Kanazawa, Japan