[1] Keio Univ, Sch Med, Dept Endocrinol Metab & Nephrol, Tokyo, Japan
[2] Int Univ Hlth & Welf Sch Med, Dept Nephrol, Narita, Japan
[3] Shibagaki Dialysis Clin Jiyugaoka, Tokyo, Japan
[4] Tokyo Shinagawa Hosp, Dept Nephrol, Tokyo, Japan
[5] Keio Univ, Sch Med, Apheresis & Dialysis Ctr, Tokyo, Japan