[1] Univ Ulsan, Asan Med Ctr, Dept Radiol, Coll Med, Seoul, South Korea
[2] Univ Ulsan, Res Inst Radiol, Asan Med Ctr, Coll Med, Seoul, South Korea
[3] Univ Ulsan, Asan Med Ctr, Coll Med, Seoul, South Korea
[4] Univ Ulsan, Asan Med Ctr, Dept Radiol, Coll Med, 88 Olymp Ro 43 Gil, Seoul 05505, South Korea
[5] Univ Ulsan, Res Inst Radiol, Asan Med Ctr, Coll Med, 88 Olymp Ro 43 Gil, Seoul 05505, South Korea