[1] Univ Ulsan, Coll Med, Dept Radiol, Seoul 05505, South Korea
[2] Univ Ulsan, Coll Med, Res Inst Radiol, Seoul 05505, South Korea
[3] Univ Ulsan, Coll Med, Asan Med Ctr, Asan Liver Ctr, Seoul 05505, South Korea
[4] Univ Calif San Francisco, Dept Radiol & Biomed Imaging, San Francisco, CA 94143 USA
[5] Linkou & Chang Gung Univ, Dept Med Imaging & Intervent, Chang Gung Mem Hosp, Coll Med, Taoyuan 333, Taoyuan County, Taiwan
[6] Capital Med Univ, Beijing Friendship Hosp, Beijing 100050, Peoples R China
[7] Tri Serv Gen Hosp, Taipei 114, Taiwan
[8] Natl Def Med Ctr, Taipei 114, Taiwan