[1] Sungkyunkwan Univ, Kangbuk Samsung Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Seoul 110746, South Korea
[2] Kyung Hee Univ, Gangdong Kyunghee Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Seoul, South Korea
[3] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Seoul, South Korea
[4] Korea Univ, Coll Med, Korea Univ Guro Hosp, Dept Internal Med,Div Endocrinol & Metab, Seoul 136705, South Korea
[5] Hallym Univ, Pyungchon Sacred Heart Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Anyang, Gyunggi Do, South Korea
[6] Sungkyunkwan Univ, Samsung Seoul Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Seoul 110746, South Korea
[7] Gacheon Univ, Gil Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Inchon, South Korea
[8] Yonsei Univ, Coll Med, Dept Internal Med, Severance Hosp,Div Endocrinol & Metab, Seoul, South Korea
[9] Soonchunhyang Univ, Bucheon Soonchunhyang Hosp, Sch Med, Dept Internal Med,Div Endocrinol & Metab, Puchon, Gyunggi Do, South Korea
[10] Seoul Natl Univ, Boramae Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Puchon, Gyunggi Do, South Korea
[11] Univ Ulsan, Seoul Asan Hosp, Coll Med, Dept Internal Med,Div Endocrinol & Metab, Seoul, South Korea