[1] Catholic Kwandong Univ, Int St Marys Hosp, Coll Med, Div Endocrinol & Metab,Dept Internal Med, Incheon, South Korea
[2] Hallym Univ, Sacred Heart Hosp, Dept Internal Med, Div Endocrinol & Metab, Anyang, South Korea
[3] Yonsei Univ, Wonju Coll Med, Dept Internal Med, Div Endocrinol & Metab, Wonju, South Korea
[4] Yonsei Univ, Coll Med, Dept Internal Med, Div Endocrinol & Metab, 50 Yonsei Ro, Seoul 120752, South Korea