1. Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine , Ube, Japan
2. Department of Rheumatology, Yamaguchi Prefectural Grand Medical Center , Hofu, Japan
3. Department of Cardiology, Yamaguchi Prefectural Grand Medical Center , Hofu, Japan
4. Department of Nephrology, Yamaguchi Prefectural Grand Medical Center , Hofu, Japan
5. Department of Pathology, Faculty of Medicine, Fukuoka University , Fukuoka, Japan