[1] Seoul Natl Univ Hosp, Dept Radiol, Seoul, South Korea
[2] Seoul Natl Univ Hosp, Dept Surg, Seoul, South Korea
[3] Asan Med Ctr, Dept Radiol, 388-1 Poongnap Dong, Seoul 138736, South Korea
[4] Natl Canc Ctr, Dept Radiol, Goyang, South Korea
[5] Ajou Univ Hosp, Dept Radiol, Suwon, South Korea