[1] Seonam Univ, Coll Med, Myongji Hosp, Div Endocrinol & Metab,Dept Internal Med, Goyang Si, Gyeonggi Do, South Korea
[2] Samsung Elect Co Ltd, Serv R&D Team, Mobile Commun Business, Suwon, Gyeonggi Do, South Korea
[3] Natl Hlth Insurance Serv, Seoul, South Korea
[4] Sungkyunkwan Univ, Sch Med, Div Endocrinol & Metab, Dept Internal Med,Kangbuk Samsung Hosp, Seoul, South Korea