[1] Yonsei Univ, Coll Med, Dept Internal Med, Div Endocrinol & Metab, Seoul, South Korea
[2] Chosun Univ, Dept Internal Med, Coll Med, Div Endocrinol & Metab, Gwangju, South Korea
[3] Catholic Univ Korea, Coll Med, Dept Internal Med, Div Endocrinol & Metab, Seoul, South Korea
[4] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Endocrinol & Metab,Dept Internal Med, Seoul, South Korea
[5] Korea Univ, Coll Med, Dept Internal Med, Div Endocrinol & Metab, Seoul, South Korea
[6] Kyung Hee Univ, Sch Med, Dept Endocrinol & Metab, Seoul, South Korea
[7] Chungnam Natl Univ, Sch Med, Dept Internal Med, Div Endocrinol & Metab, Daejeon, South Korea
[8] Seoul Natl Univ, Seoul Metropolitan Govt, Boramae Med Ctr, Div Endocrinol & Metab,Dept Internal Med, Seoul, South Korea
[9] Gwangmyeong Sungae Hosp, Dept Internal Med, Gwangmyeong, South Korea