[1] Okayama City Hosp, Dept Emergency Med, 3-20-1 Omote Cho, Okayama 7000962, Japan
[2] Okayama City Hosp, Dept Gen Internal Med, Okayama, Japan
[3] Okayama City Hosp, Dept Endocrinol, Okayama, Japan
[4] Kagawa Prefectural Cent Hosp, Dept Endocrinol, Takamatsu, Kagawa, Japan
[5] Okayama Univ, Dept Rheumatol Endocrinol & Metab, Grad Sch Med Dent & Pharmaceut Sci, Okayama, Japan