[1] Chiba Univ, Grad Sch Med, Dept Clin Cell Biol & Med, Chuo Ku, 1-8-1 Inohana, Chiba, Chiba 2608670, Japan
[2] Yu Karigaoka Tokuyama Clin, Sakura, Chiba 2850850, Japan
[3] Chiba Univ Hosp, Div Diabet Metab & Endocrinol, Dept Med, Chuo Ku, 1-8-1 Inohana, Chiba, Chiba 2608670, Japan
[4] Chiba Univ, Grad Sch Med, Dept Frontier Surg, Chuo Ku, 1-8-1 Inohana, Chiba, Chiba 2608670, Japan
[5] Int Univ Hlth & Welf, Dept Diabet Metab & Endocrinol, Sch Med, 4-3 Kozunomori, Narita, Chiba 2868686, Japan