[1] Seoul Natl Univ, Bundang Hosp, Dept Radiol, 300 Gumi Dong, Songnam 463707, Gyeonggi Do, South Korea
[2] Hanyang Univ, Sch Med, Dept Radiol, Seoul, South Korea
[3] Samsung Med Ctr, Dept Radiol, Seoul 135710, South Korea
[4] Dankook Univ, Dept Biochem, Coll Med, Cheonan, South Korea
[5] Seoul Natl Univ, Bundang Hosp, Dept Pathol, 300 Gumi Dong, Songnam 463707, Gyeonggi Do, South Korea