[1] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Med,Div Endocrinol & Metab, Seoul, South Korea
[2] Sungkyunkwan Univ, Sch Med, Kangbuk Samsung Hosp, Dept Endocrinol & Metab, Seoul, South Korea
[3] Seoul Natl Univ, Coll Med, Dept Internal Med, Seoul 151, South Korea
[4] Chungnam Natl Univ, Sch Med, Dept Internal Med, Taejon, South Korea
[5] Yonsei Univ, Coll Med, Gangnam Severance Hosp, Dept Internal Med, Seoul, South Korea
[6] Yonsei Univ, Coll Med, Dept Internal Med, Severance Hosp, Seoul, South Korea
[7] Eulji Univ, Sch Med, Dept Endocrinol & Metab, Diabet Ctr,Eulji Gen Hosp, Seoul, South Korea
[8] Ewha Womans Univ, Sch Med, Dept Internal Med, Seoul, South Korea
[9] Korea Univ, Coll Med, Dept Internal Med, Div Endocrinol & Metab, Seoul 136705, South Korea
[10] Ajou Univ, Sch Med, Dept Endocrinol & Metab, Suwon 441749, South Korea
[11] Catholic Univ Korea, Inst Med Sci, Dept Endocrinol & Metab, Immunol,Cell Biol Core Lab, Seoul, South Korea