[1] Showa Univ, Fujigaoka Hosp, Dept Internal Med, Div Nephrol, Yokohama, Japan
[2] Yokohama Municipal Citizens Hosp, Dept Nephrol, Yokohama, Japan
[3] Seirei Yokohama Hosp, Div Nephrol & Hypertens, Yokohama, Japan
[4] Showa Univ, Showa Univ Res Adm Ctr SURAC, Tokyo, Japan
[5] Itabashi Nephrorheumatol Shunsei Clin, Dept Internal Med, Tokyo, Japan
[6] Yokohama Daiichi Hosp, Dept Internal Med, Yokohama, Japan