[1] Keimyung Univ, Sch Med, Dept Internal Med, Daegu, South Korea
[2] Yonsei Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[3] Yonsei Univ, Coll Med, Inst Endocrine Res, Seoul, South Korea
[4] Yonsei Univ, Coll Med, Dept Internal Med, 50-1 Yonseiro,Seodaemungu, Seoul 03722, South Korea