[1] Wakayama Med Univ, Ctr Blood Purificat Therapy, Wakayama 6410012, Japan
[2] Shinrakuen Hosp, Niigata Social Serv Org, Dept Internal Med, Social Welf Dept, Niigata, Japan
[3] Tokyo Womens Med Univ, Kidney Ctr, Div Blood Purificat & Med, Tokyo, Japan
[4] Osaka City Univ, Postgrad Med Sch, Osaka 558, Japan
[5] Univ Tokyo, Dept Med Res, Biostat Hlth & Nursing Sci Sect, Tokyo, Japan
[6] Fdn Canc Res Hosp, Tokyo, Japan
[7] Washington Univ, Sch Med, Div Renal, St Louis, MO 63110 USA
[8] Tokai Univ, Sch Med, Isehara, Kanagawa 25911, Japan