[1] Nagaoka Red Cross Hosp, Dept Internal Med, Nagaoka, Niigata 9402085, Japan
[2] Niigata Univ, Grad Sch Med & Dent Sci, Dept Appl Mol Med, Niigata, Japan
[3] Niigata Univ, Grad Sch Med & Dent Sci, Div Clin Nephrol, Niigata, Japan
[4] Niigata Univ, Grad Sch Med & Dent Sci, Div Rheumatol, Niigata, Japan
[5] Nagaoka Red Cross Hosp, Dept Pathol, Nagaoka, Niigata 9402085, Japan