[1] Kyung Hee Univ, Kyung Hee Univ Hosp Gangdong, Dept Internal Med, Div Endocrinol & Metab,Sch Med, 892 Dongnam Ro, Seoul 05278, South Korea
[2] Seoul Natl Univ, Coll Med, Bundang Hosp, Div Endocrinol & Metab,Dept Internal Med, Seoul, South Korea
[3] Seoul Natl Univ, Boramae Med Ctr, Seoul Metropolitan Govt, Div Endocrinol & Metab,Dept Internal Med, Seoul, South Korea
[4] Catholic Univ Korea, Coll Med, Dept Internal Med, Div Endocrinol & Metab,St Vincents Hosp, Seoul, South Korea
[5] Ajou Univ, Sch Med, Dept Endocrinol & Metab, Suwon, South Korea
[6] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Endocrinol & Metab,Dept Med, Seoul, South Korea
[7] Sungkyunkwan Univ, Sch Med, Kangbuk Samsung Hosp, Dept Endocrinol & Metab, Seoul, South Korea
[8] Inje Univ, Ilsan Paik Hosp, Dept Med, Div Endocrinol & Metab,Coll Med, Goyang, South Korea