[1] Yonsei Univ, Severance Hosp, Endocrine Res Inst, Dept Internal Med,Coll Med, Seoul 03722, South Korea
[2] Yonsei Univ, Severance Hosp, Dept Pathol, Coll Med, Seoul 03722, South Korea
[3] Yonsei Univ, Severance Hosp, Dept Nucl Med, Coll Med, Seoul 03722, South Korea
[4] Yonsei Univ, Severance Hosp, Dept Surg, Coll Med, Seoul 03722, South Korea