[1] Univ Ulsan, Asan Med Ctr, Dept Internal Med, Coll Med, 88 Olymp Ro 43 Gil, Seoul 05505, South Korea
[2] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Seoul, South Korea
[3] Kangwon Natl Univ, Dept Internal Med, Sch Med, Chunchon, South Korea
[4] Konkuk Univ, Sch Med, Dept Internal Med, Med Ctr, Seoul, South Korea
[5] Korea Univ, Dept Internal Med, Div Endocrinol & Metab, Coll Med, Seoul, South Korea
[6] Sungkyunkwan Univ, Thyroid Ctr, Samsung Med Ctr, Dept Med,Sch Med,DiAs Endocrinol & Metab, Seoul, South Korea
[7] Seoul Natl Univ, Seoul Natl Univ Hosp, Dept Internal Med, Coll Med, Seoul, South Korea
[8] Chonbuk Natl Univ, Chonbuk Natl Univ Hosp, Dept Internal Med, Div Endocrinol & Metab,Med Sch, Jeonju, South Korea
[9] Chungnam Natl Univ, Dept Internal Med, Coll Med, Daejeon, South Korea
[10] Leju Natl Univ, Dept Internal Med, Sch Med, Jeju, South Korea
[11] Sanofi Korea, Med Dept Diabet & Cardiovasc, Seoul, South Korea
[12] Yonsei Univ, Grad Sch, Dept Internal Med, Div Endocrinol & Metab,Coll Med, Seoul, South Korea