[1] Kobe Univ, Grad Sch Med, Dept Internal Med, Div Diabet & Endocrinol, Kobe, Hyogo, Japan
[2] Tokai Univ, Sch Med, Dept Internal Med, Div Nephrol Endocrinol & Metab, Hiratsuka, Kanagawa, Japan
[3] Natl Hosp Org, Kyoto Med Ctr, Diabet Ctr, Kyoto, Japan
[4] Tokyo Womens Med Univ, Diabet Ctr, Sch Med, Tokyo, Japan