[1] Korea Univ, Coll Med, Ansan Hosp, Dept Radiol, 123 Jeokgeum Ro, Ansan 15355, South Korea
[2] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Radiol, Seoul, South Korea
[3] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Ctr Imaging Sci, Seoul, South Korea
[4] Hallym Univ, Coll Med, Sacred Heart Hosp, Dept Radiol, Anyang, South Korea
[5] Korea Univ, Coll Med, Anam Hosp, Dept Radiol, Seoul, South Korea
[6] Korea Univ, Guro Hosp, Coll Med, Dept Radiol, Seoul, South Korea